報日僑華
(27)育教 鸿經 日三廿二年午庚夏
同步礙,但破制
曲
二月份最佳汝聯的單位報率分别每百蠢之三十
單位打託基金公會發表谈及欧洲(包括英 〔特訊)根香港的是歐洲[英國除外
二月份表現佳
無論比對上一個月份
香港證券基金
日本證券基金最差
信託法金是否容市場的一點大及百分之二十二歲,扯着木的大處已 的最新數字顯示,今年國,證基金,也個眾生委員會的聽說會
單位信託转金。
基金的表現最佳,均
· 在二月 - 香浩證券
回報率達百分之七斯兰市。
點五。投資者繼續往税
县香內異设櫙茲基金類 單位信託基金公會八脚 易手法
,反映出本港股邬市場,在二月,名列前十 濟體系内一些阻碍貿易
百分之六點三的認股權
部份分别基新加坡勇來
四股
來位 雜類的
雞
·市抵,另二假投資在美
洲
鬆
金樽的金,本 美洲基于舒响
在二月,出於日本
在於現的
| 個或幸島百分之一ㄓ六 紡織品輸美配額
西絲為克的文持,持綠
順示出瑞士法缸因造
作市一日的性們大馬法公系是結荬行東山
,
二月十八日爲止的一年 英國商家來造成衣有大幅下降,只有百 _至一九九〇年 〔特訊】今年首季 九贴塑六,但棉麻毛衫
一月運用率下降
菲律賓鹰券基金” 證券市賓的蓬勃。 反映。 一平均囘報率爲百分之八]紡織品転夹配運用率一发低。 十三點二,反映出當地 比去年同月下降,可以今年一月辙箎紡織 品配額運用率比去年同
持百分之七十七點九的 千六百多萬平方米,佔 年饼抱減少亦將成定語
| 計算的話,則仍能維 包括成表)美總八 推理,首季接單比去
| 下降薮第二位,若以二年首創館 an a
高已報率。
+1
| 平均胸幹率百分之四分之三點六。.
·加,但本港整性紡織製
郴賀成衣配額運用友生產好轉形勢到館
·列鄉四及第五位率仍然高企,遠百分之三學才街出現。
企业品展進有正談經
曾市浙不及樂詞。期內,
雜况 福满的 濟會者,低生三 現
添飲,設長 與不
、過二戰的生意更只有百分之認可基金,値瓿達一
品有汽琪及烟酒。汽車
經濟及消費、投安不
在去年十一月的, 有明顯菘結〔中國選
社〔〕
的缓腿
碍障易貿除消日美,現由在校代演示 但愿公會
下理金現
推
出
球的,使度他獨坑液是:碍立有進酒能送大荳樂 。步但其定能更至之要一的官方談行展於與選會議 珠后底 要-
加球給我 貿易程,的=短月已上院
线 位有可展 亞長踏有佐爸 時利 信 培投 有些美佳 载入崁的說評師二 的方 已化的現 位每门的'
樓
一期星 日九十月三(日九九一)年九十七國民華中
期潮低處濟經
轉需內香
弱求部港
·本資用留與單接業工,養消部内
0响影鎮連生發已,降下的資物
降,但進這與豬均減少超過一成,就明工商業處境稍差。 料、半製成品單位價格雖略埚下 香港海┐百何的資本執資和題材 再投資低降的情况有關。期內人 然是與工業生產及工商業投資獎、 (e)
十分短線的海外副牌,兩個行業平均分别態有點二三和二點七一個月 工業接胜的情况未有菰家轉活,尤其是紡織業及塑膠常均只能到
情况會逐步改善。 年 然寳節。相信在經濟轉活之時, E 還是經濟處於低增長循環期的自 的步噩示香港港的內部而求放緩。 查 資值及数量幾乎全面下降,初一 香港近期的选口用各類物
濃,但現時尙歡自是否形成趨勢 一 收八八年同期下降百分之四和百 一號 留用物資的總價值及數量,分别 。香港的內需求初呈倒退的現 分之七,是近年來的再次角度。
去年十一月份香港進口各類八
銀行金融、諮詢發湖、作另話。另外,香港戲濟增長;在踏入
我是建築機械、新體及其銷路才見叫活。 野 誌活躍,是經濟輒型的減少校的耐用品站,但白是次公佈的 其中捏誌,服務行業如費,除非必需添辉,調顯示,亞洲仍有良好的 遒口,仍有開定的增長理想。在包濟特推低烟 新公佈的數字時說:「
期分勞上密集的工業生產程序轉移至大陸,按單豫轉至大陸企業。 |公室使用的機械設峭的口及容售情况也不大 公會主席紀立利評為最 能力應熱世安放緩,將其他結用消費品的香港單他信託基 本物資的下降,很大程 期因普遍預計會加稅,黃金股票方面的基金 不過 - 卷箫留用資|年同期均告下挫,近現最著。快投資在
摊成的表。信幾年經期、雖新公 個不
茨
一內部有烤需求也出 出外旅遊及旅遊消費 表現强酬及擁有多元化 “ 龠突不斷作出投資,美經濟版,使當地人。由於香港易可基金的
「現下降。在去年十一月 前爲少。
位價格僅增加百分之五
之六更低,但其過口货 生意額雖有增加一成,
的於
首别
lowlying
(e) – a
to
風悻
麼對種稙問題,奪該在乎深刻的那解:「
av 跳飛機,與打開抽水都不符事實。若到了卜一歲,那 但因為我的然想那隨學院的鋼琴老師被這是我最大的損失。 威力有選擧
大學的粱方便學學外, 莫里的READINC 學琴,所以最後換 離偷敦呾郎西
教到曉
1990 中學會考預習專欄
明德出版社
MILI & DALE PRESS
Geography (24)
Figure 2
the coastal. labelled A, B, C, D & E.
features
會,的雨易洲日美德馬政國電華路, 在相會進院除左國淨爾部剧 短個該行碍貿就和,福長則美頓社?
the erosional work of (c). Why is
seawater so active at yin.
P. F. Chan
2. (a) Name
(b) Exp}ain the forniation of feature
y
Section A
Land
1. (a) Describe and explain the change of mean volocity from headwater downstream as shown in Figure 1.
(b) Why is the channel shape near headwater differ from that at the lower course?
(c) How does the variation in the volume of flow between dry and wet season affect the work of a river?
(d) Refer to Figure 2, give a name
to the feature marked 'X'.
(e) Describe and account for the
physical characteristics feature 'X'.
of
m/sec.
Feadwatur
Scaled : 1
mouth
Scale: 10
Channel shape at the lower course
Channel shape near headwater
Contour In metros
Sand
(d) What kind of coastal features are expected to be found later at Y if under continuous wave attack? Briefly explain how.
(e) where can we find the feature
'B' in Hong Kong?
(f) What will happen to the coastal landforms in this diagram if the land is under
1. emergence ahd
ii. submergence.
Motros
Suggested Answer
1. (a) The mean volocity will gradually
increase from neadwater
downstream & is the greatest at. the acÙth.
Reasers:
--although gradient gradually decrease downstream, it is compensated by
i.
increase volume of water.
ii. wider shape of river
channel.
iii. smooth river hed, reduce
friction.
iv. laminar flow of H0.
(b) Channel shape at headwater is.
narrow. V shaped because -usually :at mountain top;
rugged relief.
not enough water for lateral erosion.
concentration On vertical erosion (downcutting) and headward erosion.
lower course, wider & flat river bed.
increase water volume from tributaries.
-main work is lateral erosion. therefore wider channel shape.. meander is formed.
(c) The
river include:: ansportation and
wet seasor. volume of. Flow will increase, the river will concentraten erosion. esp. laterake
During dry
Tow will
may have less
direction of wind
transportation deposition:
Voffie of reviver erosion, more and even
Figure 1
Flat rock and
3 fathon line
of (e) amplitude"
the Wave isplayed on the screen of the found
Of
4. Figure 4 shows part of a cathode ray
An tube.
undeflected beam cathode rays its the centre 0 of the florescent. screen.
1990 中學會考預習專欄
明德出版社,
MILL & DALE PRESS.
Physics (25)
Explain, briefly, in energy changers, why.
the Junge decreases,
heater
arode.
3. (a) Figure 2
inute cathode
ray tube
cathode
Heater
C. Y. Mak
Cathode
Anode
(a) Explatu How
produced?
好吧。
(b) Why must
tere
ELT
ارم
(d)x is a della,
Solutions:
1. {a} The total charge gassing through
the tube per second
currant 'x'ti
A second
feature
composed
depositional
of silt&
clay (fine particles) foundat the river mouth.
river carried a large amount
of fine sediments and deposite
them at the river mouth. because the speed of decrease when meet the sea,
- shallow coast.
2. (a) A
8:
ü:
flow
different shape of delta as a result of nature of sediments. e.g. bird-foot delta, estuarial delta.
headland, promontory. tombolo.
geo. cliff.
Et sand spit.
(5).x is a beach.
Formed by deposition of sands,
pebbles & pravels.
caused by long-shore drift
constructive wave, when
swashis greater than, backwash..
at a well-sheltered site..
(c) Why is the erosional work active
exposed to prevailing wind, - headland.
Fongest fetch.
(d) At Y cliff and wave-cut platform 1%. Explain how? 4%, seacave, blow hole with diagram 1%.
(e) Cheung, Chau.
(f) If under emergence, there is raised beach, raised tombolo and raised (platform, more gentle coast.:
If
under
submergence, disappearance of depositional :feature, off-shore island
ii. As the voltage
between the cathode and anode increases, the electrons are more energetic when they reach the anode.
jii. As the heater current increases,
number
free electrons increases and the current increases,
electrons in one
(b).
tel.charge produce in one second
charge. of an electron
etron bean is
1.6 x 107
be very Low
5 x 1013
Xeray will be emitted and is not deflected by magnetic field.
The number of electrons reach the anode in one second
(5 & 10A) x (fs);
-19
1.6 x 107
14
-.3.123 x 10
(Ans.)
ii.The. kinetic energy
electron
of
an
花上 張庭
-certain cathode ray
electrons are accelerated through a potential difference of 500V. if the current produced by the electron
is 8 x 10 A, calculated
(a) how many electrons will reach
the anode in one second.
fcharge of an electron=1.6x10-19 coulomb)
(6) the kinetic energy gained by an
..electron.
(c) the speed gained by an electron if-the electron is released fron the cathode with negligible velocity...
(mass of an
1. electron=9x10-
2. 4s shown in figure i, a bar magret is attached to the end of a spring and oscillates vertically inside a solenoid. A C.R.D. (Catrode Ray Oscilloscope) is connected to the terminals of the solenoid. (Neglect the air resistance)
coll
C.R.D.
screen
Figure 2
Explain briefly
there 1. why
must be very little air inside the tube. ii. what could be the effect if the voltage between the cathode and the anode were increased.
ili. how the electrón current varies as the heater current increases.
if
metal 嗯
target inserted between the cathode and the anode as shown in figure 3.
Heate
Cathodo
tergat
E.P.
Supply.
Figure 3
e
pressure inside the cathode ray tube?
(c) Refer
the to
我想
in
figure, where will the beam of cathode rays hit the screen 1. if plate A is given
positive charge and plate B is given a megative charge.
ii. if plate C is replaced by the north pole of a..magnet drid plate B is replaced by the south pole.
'(d) Figure- 5 shows the end-on view. of the screen.and. the foun electrodes inside the tube) as seen by the eyes in figure 4.
Figure 5
To plate 4
Figure 6
Clare B
Figure 1
(a) Sketch, the wave form that will
be displayed on the screen of the C.R.0..
(b) How the wave form is affected by
using a stronger magnet?
(c) How the wave form is affected by increasing the number of turns of the solenoid.
(d) How the wave form is affected if
the bar
ascillates: magnet faster.
What kind of ray will be emitted by the metal target? Does it. deflected y magnetic field?
(b) If the cathode ray tube carries acurrent of 5.x 10-5A when the potential difference between "the cathode and
anode is 24 KV. Assume the electrans relessed from the catrode with negligible velocity and the charge of
electron -19
1.6 x 10 coulomb.
i. find the number of electrons will reach the anode in one second.
ji, find the kinetic energy of an electron just before it reaches the anade.
Figure?
If the circuits shown in figure 6 and figure 7 are connected to the e`ectrodes.as. indicated, copy figure. 5 and sketch what you will see on the screen,
Ta plate D
(Ans.)
(b) The kinetic energy gained by an
electron
(charge of an electron}
x. (potential difference)
1.6 x 10 10777
x (500)
(Ans.)
註 B x
(c) Let the speed of the electron be
219 × 10^31 )v2 = 8 x 10-17
16
* 1014
x-10/
:1,333x10/img-t
(Ans.)
2. (a) The wave form is:
(b) The. amplitude of
the wave displayed on the screen of the C.R.O. will increase..
(c) The
Wave
amplitude of the displayed on the screen will increase for the induced e.m.f..
(d) The frequency of the wave with
increase.
(e) An e.n.f. is induced and the
of energy
the spring is dissipated.
3. (a)
i. Very little air inside the tube. in order to minimize the rumber: afcdlisions. that the electrons neke with the air molecules.
= (charge of an electron)
x (potential
difference
between anode and cathode)
- (1.8 x 10-19) x (24 x 103).
= 3.84 x. 10
(Ans)
4. (a) The cathode is heated by the.
heater. Electrons are emitted
Since: by thermionic emission. Thigh potential difference is connected across the anode and the cathode, the electrons are then accelerated from the. cathode to the anode. Hence, a electron beam is formed.
(b) Very low pressure inside the Cathode ray tube in order to minimize the number of collisions that the electrons make with the gas molecules.
(c)
1. The beam of cathode rays will
hit the screen somewhere on OX! ii. The beam of cathode rays will
hit the screen. somewhere on OX'
{d} lf the frequency of. the aternating voltage produced by the a.c. source is very small, a bright spot (P) will be seen
·moving..to`and fro along a line PP parallel to "YY If the frequency is high, a bright line PP! will be seen as shown in the figure...
【招来:
自覺 人兒而