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【单选题】
据报道，某医院正在研究用放射性同位素 I 治疗肿瘤，该同位素原子核内的中子数与核外电子数之差是（ ）。A.
72
B.
19
C.
53
D.
125
E.
178
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举一反三
【单选题】Communication satellites generally use solar cells as their source of electric power, although some test satellites have used thermoelectric generators.
A.
superior
B.
authorized
C.
former
D.
experimental
【判断题】A source annotation is your reflection over how you plan to use the source.
A.
正确
B.
错误
【单选题】People in Bangladesh can use____as a safe source of drinking water.
A.
ground water
B.
rainwater
C.
drinking water
D.
fresh water
【单选题】Why is a website mentioned?
A.
To promote the use of online services.
B.
As a source of information.
C.
For speedier ordering.
D.
To settle complaints.
【简答题】两节课时间,请每位同学完成期末实践考核(一)Word 排版; 期末实践考核(二)表格设计与制作,为选做题。
【单选题】What phrase does the writer use to mark the point where he moves from dealing with Source A to Source B?
A.
It has been claimed that ...
B.
On the other hand
C.
Source B considers that...
D.
He believes that ...
【简答题】(ii) Comment briefly on the use of its own tree plantations as a source of raw materials by Our Timbers Ltd. (3 marks)
【单选题】Ground-source heat pumps
A.
are not yet available for domestic use.
B.
produce four times more energy than they use.
C.
can save over ￡8000 a year.
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