( 19 )育教日一初月三年巳己夏
報日僑華
四期星 日六月四(九八九一年八十七國民華中
育教
CUSS
1
B|cose
1989 中學會考預習專業
明德出版社
MİLL & DALE PRESS
Additional Mathematics (27)
1
·AX -1
9
= 10x
(Ans.)
10x + x{40x&......
A
- 270 - 180°
= 90°
[Ans.)
[DAD + [DBU + [000
5. (m =
(90" -
• !90° - /DOR}
10)** + (2m - 4)x + 2 = 0 discriminant
(90° - ZDOC)
-(2m - 4) - 4(m + 10)(2) .16m 16 8m 80
= 452
= 4(m2 - 6m - 16). (Ans.) f(x) 0 for all real values of x
ac 0 and + 10 < 0
m2 - 6-160 and m-10
fa
= -sinx - 2cast, (Ans.)
(a = 8)(m + 2) < 0. -2 cm (8
2. 3x
Çax ...
(1)
2 y
..range of m: n < -10
(Ans.)
Sub. x 2.1 (1)
W.S. So
Revision Exercise 27: Solution to Paper 1, Section A
Section A
Slope of tangent at point (2, 3) is 2.
3(2) - 6(2)a + b = 2
12: 10(Ans.) Sub. (2, 3) in yx - 3x2 - 1x4c 3 & 12a 2b c C = 12a -5 246 20
-12a 15 (Ans.)
1612*
0 = (Ans.)
7.case (1) x > @
6,
(2 + 36)(73 - 56) = 0
1
--Sika 2005x =
sinx
0
. (à - 4B)(7ã - 26) = ?
- 6x 2.2x - x
-7x-7
אכל:
1562 + 16 3.b = 0
(1)
Lanx = -2
i.e. 0 < x ( 1.....
(1)
X
2.03 rad, or
7â2 + 852 - 305-6 - 3
(2)
on 5.18 rad. (Ans.)
When x 2.03
10
d'y
= 2.24 > 0
1:0
1513
10'1
* ! 1
(a)
10
+10xxx +
- 1, 2, 1+ 2i, 2 =
242223
+ 31
(1) x 15 10532 - 2255 2403 . b-o (2) x 8 +) 56a2
6462 - 240a b=0 16152 = 0
A
ase (ii) x < 0
1 + X X
X + 1
When x 5.18
(Sus.)
= (1 + 1) + 21)(1 + 31)
=-10 [Ans.)
dy
-2.24 (0
* D*....(3) |à¦2 = 1612
ï.e.
(2)
dx
(b
in
{ x + 2 x } }
10
10
4X-0
1989 中學會考預習專欄
明德出版社
MILE & DALE PRESS
Economics (28)
Alain Li
INTERNATIONAL TRADE
If there was no tride, everyone would
himself all have to produce for
he
required and so there would be chance for division of labour.
ro
Effects of International Trade
International trade can produce 2 significant effects:
1. Global efficiency
International
trade
enables
ینده دو گرم را
international, division of labour. Just as division of labour within d
economy country makes its efficient, division of labour among Countries contributes to global efficiency, ),e. the gains from
comparative advantage and economies of scale.
2. Improvement from competition
International trade
also
(b) 2004 : 2905 - 7000 = arg(2,4,7;)
= arg (-10) = 1966
grinducers, who inust help down their orices to compete with formigaers.
Causes of International Trade
There are 2 basic causes of trade.
1. Lack of self-sufficiency
Can
be
As natural resources are not evenly distributed
this in
world and production skills vary from country
country to country, no completely self-sufficient in all natural resources cr finished products. So every country needs to trade with others.
2. Different production cost
AS different countries different, natural resources different production skil will be muty beneficial, country camzes ja produkng it has 3 thoseTION
e. higher
cost,
and
greater
oroductivi
obtains through trade these things that it cannot produce cheaply This can be illustrated
the following 2 concepts: Ste Advantage
Duntry is said to Fave an abstute advantage.
the
uction of a good or service if it can produce, with the same ancunt of resources, more of that good
than or Service another country.
Clothing
Feed
| Ebontry A)
30
20
TOY
Country Bl 40
15
HONG K
domestic producers up to increased competition from Toreigners and thus reduces their market power. Consequently, a consumer purchases
cheaply both
and from domestic
QUCOS
More
foreign firms
1989 中學會考預習專欄
明善出版社
ALL & DAŁU PRESS.
from
3.4 Sume common plastics and their uses
Polymer
Properties
Table 28.1: Output per the same
amount of resources.
in 2 countries -
Table
the maximum value of y is ca55.18 25:n5.10
2.24 (Ans.)
28.1 illustrates that
has an
Country 4 has an absolute advantage in the production of Food and Country B absolute advantage in. the production
of clothing. Therefore, the most efficiert allocation of resources is to have Country A specialize in food production and Country B in clothing production. The effect of such a division of labour is ilustrated in Table 28.2.
[ing]
Food
40
Country
Country
()
Tabl: $4.2: ect of
specializat
Sub (3) in (2)
15 30.6
advantage in the production of both clothing and food. However, Country X only has a comparative advantage in the production of food. Because when comparing the opportunity cost, Country X only has to give up 2 units of clothing to get 1 unit of food while Country Y has to give up 41 units of clothing to get 1 unit of food. Therefore, it Country X specializes in the production of food, it will sacrifice less than Country V.
On another hand, even though Country
has no - absolute
圖
Now, the total clothing output becomes 30 units and the total food output becomes 40 units, t.e. 10 to 5 units respectively more than before.
is
11) Comparative Advantage
A country said to have a comparative advantage in the production of a good or service if i cen produce that good cr service relatively more cheaply, j.e. at lower opportunity cost, than another country.
Clothing Food
30 Country X 60 Country Y 40
ota
10
100
40
lable 20.3: Output per the same
amount of resources in 2 countries
Tally Country
28.3
X
has
an
illustrates. that absolute
4. Pollution
4.1 Plastics are non-biodegradable and
hence cause disposal problems.
4.2 Burning of plastics give off toxic gases which thus pollute air. e.g. Burning of PVC gives off HC and
لا
antage in producing anything.
still
а has comparative
Advantage in the production of clothing. Because when comparing
The opportunity cos Country Y only has to JUS food to el
0.5
of
25 unit of clothing
give up
to get 1 unit Therefore,
country specializes in the production of clothing sacrifice less than CamYS Under such circumstances, Country X transfers
resources used in Soucing clothing into the production of food and Country Y specializes in the production of clothing, there will be some gains totally. This is illustrated in Table 25.4.
Clothing
Country X 20. Country
Food
Total
80 100
Table 28.4: Effect of
specialization
(i)(1)What is meant by
polymer"?.
thermosetting
(ii)Which one of the cat polymer's
BE
is of this
(j) Which uninove-list can be
recycled?plar briefly.
KONG PUBLIC
Chemistry
Some Common Uses
Plastic sheets, bags; cups. Lighter than water.nottles, etc.
... Polystante(PE) Transparent, (Branched chain) H.D. Pelythene (PE) (Straight hain)
Polystyrene (PS)
Expe iced PS foar
Polyvinylchloride
Hard, crystal clear: white coloured, rigid, neat insular.
R.
Chu
Backets, boxls, plastic hose- pipes etc.
Sample bottles, light fixtures etc.
Packing materials, disposable cups, etc.
Transparent, stiff, Pipes, gramophone records, floor! brittle.
tiles, wall papers, table cloths, ving! raincoat.
windows, as glass substitute,
(PVC)
Perspex
Glass-like, hard
Contact lenses, aircraft
and Lough.
tylon
White and smooth, hard and strong.
Rakelity
rea-methana!
Polyesters e.g. Dacron
Cellulose plastics
3.5 Shaping Plastics
Dark-brown. opaque, hard and brittle.
Transparent, Icolourless.
Transparent, hard
and strong.
hard and tough.
(a) Thermoplastics can be shaped by the
following methods.
(1)Injection moulding. e.g. bowls,
cups, toys, etc.
(2)Blow moulding e.g. bottles.
hollow toys, etc. (3)Vacuum moulding (Thermoforming). ely. coses, trays for sugar,
sign board, etc.
Ropes, fishing lines, stockings, tooth-brush brittlas, gears, bearings, etc.
Electrical fittings, switches. hardies of cooking pans, ata.
Electric, plugs, switches, etc.
Textile fibres.
Spectocle frames, ruler, set-squares, etc.
eggs and chocolate etc. (4)Extrusion, e.g. rods,
tubes, sheets, etc. (5)Calendering. (Laminating)
plastic films..
pipes
e.g
(b) Thermosetting plastics are usuall, shaped by compression moulding e.g. ash trays.
Question 16-1
Polymerization is a Drocess of linking together many small molecules to make giant solecules called polymers. It can
by occur
means of addition CT condensation reactions. (a) that are usually called the smell nolecules from which a polymer is made? (b) State
Two essential differences between addition polymerization and condensation polymerization. Given below are the structural formulae of FIVE simple organic compounas denoted with letters A, B, C, D and E.
-) When meated with soda lime, one of theve polymers gives off an alkaline gas. (i)What is the gas? (11)Which polymer is it?
Question 16-2
Part of a polymer Orion is shown below.
CH2 CH - CH2 - CH - CH, - CH +
CN
a
i CN
CN
diagram to strow the structure of its repeating unit.
Xal graw
(b) Draw the structural formula of the
mononer from which Orlon is made. (c) Is Delon an addition, polymer or
condensation polymer?
Polyethene is a thermoplastic polymer. (d) What is meant by. thermoplastic?
from which (e) What is the monomer polyethene is made? (f) State a source of this monomer in
industry.
Name the process by which it is usually obtained from this source.
b + 6x -2x - x - 1
9x x -7
X 3
333
7 * * * 0
combine (1) and (2)
3 x < 1
(Ans.)
Now the Lotal output of clothing is same as before but the total output of food becomes 50 units, i.e. 10 units more than before.
economic
which
Trade Restriction
trade Though
may bring benefits, 'protectionism'. advocates trade restriction to protect domestic industries, risas again.
-There are 5 forms of trade restriction:
1. Tariff
tax A tariff is
imposed on foreign goods. This makes the price of foreign goods higher and hence less competitive.
2. Quota
A quota is a maximum limit on the quantity of foreign goods that may be imported.
3. Surcharge
A surcharge is રો tax imposed on imports in addition to the normal? tariffs. This is used to deal with an emergency situation.
4. Embargo
An embargo is a ban on imports from foreign countries.
5. Exchange Control
Under exchange contrul, importers must apply to the government for permission to obtain the necessary foreign currency. to buy imports. There is often a limit on the amount of foreign currency that can be bought. Therefore the government- can control the amount of currency that is to be spent on foreign conds and services.
(e)(i)B and C or B and D).
(ii)Their molecules contain two
functional groups each.
J .. 1
0
(iii){C}-((,),C-C1+nh,N(CH, ),NH,
0
-¿{CH 2)2 C-NICH2) E
} }
*|5
3
{ - INGE (
師生關係,一
不宜多。
· '(九)切忌本末倒
【八】宏裤杏宜幣
體發乎情、止乎號,則可免自己困入兩難 之意蛾,亦可免對方望迩感情的深淵 "
爲對方設想,但最近正的老師給學生
·冯研的基礎應針對
的愛的彖基本。
源本的基本內容,如
購
天神
It i
無須入購
九龍上海 九龍旺角 K 77099
舖及
致利
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地王
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保密摩電照本朝423號
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038, 157
045160
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117
119 168
2892223328-BA¶792986 8
·荷李活道總社俓箱號碼
185
138 192
146
OR
Lion, &
»C1-C{CH,)C-C7+nH(CH,30H
0
0
153
+ пHC1
(f). Rubber.
(g) Perspex. (h) Rayon..
(1) A "thermosetting polymer" is one which can be heated once and does not melt on further heating. Bakelite is a thermosetting polymer.
because it iş (j) Perspex:
thermoplastic. (k)(i)Ammonia gas.
(ii)Nylon.
Solution to Q.16-2
(a) The repeating unit is Ci, - CH
an
CH
D
1
8:
A: Ch2C - C - ÙCH,
C(CH24
01
C1
C: H2R{CH2)¿N2
【尖沙咀星光行
23-7351861 3-
PERSAI
5-217205 5-
E: CUCCI
CN
扫雞淘毯康中,
5-8907133
(c) Give
the
compound(s) polymerize.
Telter(s) · of which Would
the
(b) The monomer is CH2 = CHCN.
旺角續數道631
3-325655
not
(d)(1)Give the
of
the
compound(s)
could
Nylon 6.6 is a condensation polymer, (h) Give the structural formulae of the monomers of which wylon 6.5 made.
(c) It is an addition polymer.
荃灣地雞站商
iş
Solution to 0.16-1
letter(s) which polymerize by addition reaction. Explain your choice briefly. (11)Write an equation to show how the
polymer is formed.
a
(e)(i)Give the texters of TWO compounds
which would
form react. ใบ condensation polymer. (ii)hat special structural feature makes these. compounds undergo such a reaction. (iii)Write
an
equation of
the
reaction. Listed below are some common polymers.
nylon, rubber, perspex, bakelite. "ayon, cotton.
(f) Which опе is a natural addition
polymer?
(9) Which one is a synthetic addition
polymer?
(h) which one is, a synthetic polymer
made, from a natural polymer?
(g) Polyethene products can be recycled industry. Suggest one way of doing this.
(a) They are monomers.
(b) Two differences are:
(c) E
are
(1)mall molecules such as #20, HC1
or NH.. etc.
Usually eliminated during condensation polymerization.
(2)Addition polymerization usually
involves
(d) A thermoplastic is one which can be melted on heating. It does not have cross-linkage.
(e) The monomer is ethene.
(f) Petroleum industry.
Ethene
is obtained from the
.thermal cracking of the large
alkanes contained in petroleum.
(g) Heat the polyethene products to
melt and remould it.
[h) The one kind of monomers but condensation polymerization involves at least two different
monorer's.
{d}{i}A; because its molecules contain
2 carbon-carbon double
are
monomers of nylon 6.6
6-diamine and hexane-1, hexane-1, acid
6-diaylchorice.
hexa-1, 6-dioic
or
II, MỊCH, NH hexa-1, 6-diamine.
bond
(C) each..
(ii)n CH,C
CH2
CH,
+C
H
COOCH,
COOCH,
HEOC (CH,} COOH
hexanc-1, 6-dioic acid
C100(CH2140001
hexane-1, 6-dioy dichloride
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