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【简答题】
—Bruce was killed in a trafficaccident. — I talked with him yesterday morning! A. Whata pity! B. I beg your pardon? C. Sorryto hear that. D. Is that so?
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【简答题】密度是指材料在____________状态下,单位体积的质量;表观密度是材料在_______状态下单位体积的质量。
【简答题】材料的实际密度是指材料在( )状态下 ( ) 。
【单选题】The goods will have to be re-packed here in order to ______ the loss.
A.
low
B.
minimize
C.
increase
D.
ensure
【简答题】Dear Sirs Re: Our order No. 325 Further to our telephone conversation regarding the packing of the above order, we would like to propose the following: 1. Our s would like to have the products p...
【多选题】用离心泵将水池的水抽吸到水塔的稳定操作中,若离心泵在正常操作范围内工作,开大出口阀门将导致
A.
送水量增加,泵的压头增大
B.
送水量增加,泵的压头下降
C.
送水量增加,泵的轴功率增加
D.
送水量增加,泵的轴功率下降
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