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【单选题】
一般大流量离心泵多采用（）叶轮。A.
单级
B.
多吸
C.
D.
其他
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举一反三
【简答题】He had to _______ the mud off his shoes before coming into thehouse. A) scratch B) sc C) strap D) stroke
【单选题】What did Tim's company arrange before he left?
A.
A . a short visit to Dubai before moving there a short visit to Dubai before moving there
B.
a personal contact with the team in Dubai
C.
a language course in Arabi c
【单选题】. Tim, you should briefly ___ the main arguments before the voting.
A.
calculate
B.
identify
C.
observe
D.
summarize
【单选题】Why is Tim Pearson coming along today?
A.
To do an interview.
B.
To plan an interview and some filming of the Museum.
C.
To talk about the Museum and give a talk about money.
D.
To plan an interview and a tour round the Museum.
【单选题】如图，有N个电量均为q的点电荷，以两种方式分布在相同半径的圆周上，一种是无规则地分布，另一种是均匀分布，比较这两种情况下在过圆心O并垂直于圆平面的z轴上任一点P的场强与电势，则有（）
A.
场强不等，电势不等
B.
场强相等，电势相等
C.
场强分量Ez相等，电势相等
D.
场强分量Ez相等，电势不等
【单选题】_______ for the coming examinations before, I have no time for the film.
A.
Not preparing
B.
To prepare
C.
Having not prepared
D.
Not having prepared
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