题目内容

In a word, we have no doubt ________ you are perfectly sound in mind and body.

A. that
B. when
C. what
D. whether

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At least 76 people died when a Sibir Airlines Tu-154 ________ into the sea about 180kilometers from the Russian resort of Sochi on Thursday.

A. dropped
B. jumped
C. plunged
D. declined

绕组Dd联结的三相变压器的一次侧的额定电流等于()

A. 变压器额定容量除以一次侧额定电压的2的平方根倍
B. 变压器额定容量除以一次侧额定电压的3的平方根倍
C. 变压器额定容量除以二次侧相电压的3倍

________, we’d better make some changes in the plan.

A. That is the case
B. That having been the case
C. That to be the case
D. That being the case

绕组Yy联结的三相变压器的二次侧的额定电流等于()

A. 变压器额定容量除以一次侧相电压的3倍
B. 变压器额定容量除以二次侧额定电压2的平方根倍
C. 变压器额定容量除以二次侧额定电压的3的平方根倍

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