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【单选题】
一段直径不变管道的流速从 2m/s 增加到 4m/s 时,在水流都处于紊流粗糙区时,沿损失是原来的( )倍A.
1
B.
C.
2
D.
4
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举一反三
【单选题】He_____ articles for our wall-newspaper these years, and he____ about thirty articles.
A.
has written; wrote
B.
has been writing; wrote
C.
is writing; has been writing
D.
has been writing; has written
【单选题】以下关于分公司与总公司的组织结构模式的说法正确的是（ ）。
A.
分公司有自己独立的名称
B.
总公司对分公司的债务没有责任
C.
分公司受总公司控制但在法律上独立
D.
较多出现在由横向合并而形成的企业中
【单选题】He is _____ tearing up what he has written and beginning over again.
A.
simply
B.
constantly
C.
gradually
D.
generally
【单选题】He has written some very good poems, but he is ________ known for his short stories
A.
the best
B.
more
C.
better
D.
the most
【简答题】A．Because he is interested in the subject. B．Because he has already written a paper on it. C．Because he doesn't know anything about it. D．Because it is very abstract.
【简答题】A．Because he is interested in the subject. B．Because he has already written a paper on it. C．Because he doesn't know anything about it. D．Because it is very abstract.
【单选题】After he has written his paper, he found some additional material______he should have included.
A.
that
B.
of which
C.
in which
D.
whom
【简答题】The last novel of his is by far ______ he has written. (good)
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