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【单选题】
1识图常用符号及图例试题.docA.
A
B.
看图中信息
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【多选题】关于旋涡泵下列说法正确的是______
A.
闭式叶轮要配闭式流道
B.
与叶轮直径、转速相同的离心泵比，其扬程要高得多
C.
效率一般比离心泵低
D.
工作时液体相对叶轮的运动轨迹是一条后退的螺旋线
【单选题】_________ many times, but he still couldn’t understand it.
A.
Having been told
B.
Though he had been told
C.
He was told
D.
Having told
【单选题】I think no news ________ good news, he will be back soon.
A.
is
B.
are
C.
was
D.
were
【单选题】What did the man do?
A.
He didn't tell Alice the news.
B.
He told Alice the news.
C.
He asked the woman to tell Alice the news.
【单选题】After the international news, he went on to listen to the_____news.
A.
non-violent
B.
national
C.
native
D.
nationality
【单选题】关于旋涡泵下列说法正确的是（）
A.
工作时液体相对叶轮的运动轨迹是一条前进的螺旋线
B.
开式叶轮只能配用闭式流道
C.
回流调节流量比节流调节效率高
D.
开式旋涡泵只能做成单级
【简答题】he news is spreading around the airport is a heavy storm is coming. A. what/ B. that that C. /that D. that which
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