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【单选题】
流体强制流动时,为保持其压力,克服摩擦引起的能量损失,需要的动力是( )A.
重力加速度
B.
动能
C.
静压能
D.
外加能量
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反馈参考答案：
举一反三
【单选题】Hardly ______ ____ at the office when thetelephone rang. A) I a rrived B) I had arrived C) did I arrive D) had I arrived
A.
I arrived
B.
I had arrived
C.
did I arrive
D.
had I arrived
【单选题】When I _______ the museum, I found that it _______.
A.
arrived; closed
B.
arrived; was closed
C.
reached; closed
D.
reached; was closed
【简答题】When I arrived at the theatre, all the tickets (sell) ________ out.
【简答题】( )除了不挂国旗、不奏国歌以及出席规格不同外,其余安排与国宴大体相同。
【简答题】I __________ playing tennis with John when Bob arrived.
【单选题】He was _______ the preparation of an international conference when I arrived in Beijing.
A.
engaged to
B.
engaged for
C.
engaged on
D.
engaged in
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