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【单选题】
一把名义长度为 30 米的钢卷尺 , 实际是 30.005 米 . 每量一整尺就会有 5 毫米的误差 , 此误差称为( )。A.
容许误差
B.
偶然误差
C.
系统误差
D.
相对误差
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【简答题】Wei Hua may be on the team. or Ann may. ______ Wei Hua ______ Ann may be on the team.
【单选题】—What’s in your living room? —____ a TV on the wall. A. It is B. This is C. That is D. There is
A.
It is
B.
This is
C.
That is
D.
There is
【简答题】The reaction,A+2B→C+2D,is run three times. In the second run, the initial concentration of A is double that in the first run,and the initial rate of the reaction is double that of the first run. In th...
【单选题】A . It is stable. B . It is durable. C . It is inexpensive. D . It is sophisticated.
A.
B.
C.
【单选题】Hello, may I speak to Zhao Hua?（）
A.
My name is Zhao Hua
B.
I'm Zhao Hua
C.
This is Zhao Hua speaking
D.
Zhao Hua is me
【单选题】Conversation2
A.
Heis clever．
B.
He is severe．
C.
He is not naughty．
D.
He is naughty．
【多选题】2What is the difference between D/P and D/A?
A.
D/P is much safer for the seller than D/A
B.
D/P after sight and D/A both adopt the draft.
C.
D/P belongs to collection but D/A can be remittance.
D.
D/P can be sight payment while D/A is only time payment.
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