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【简答题】
已知交流电压u1＝75 sin(ωt－30°)V，u2＝75 sinωtV，u3＝100 sin(ωt＋60°)V，u4＝100 sin(ωt－90°)V。①写出各电压的表达式；②利用运算求u1＋u3，u1－u3，u2＋u4以及u4－u2。
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举一反三
【单选题】It was ordered that all the soldiers ____ to the front．
A.
should send
B.
must be sent
C.
be sent
D.
must go
【单选题】It was the order that all the soldiers ________to the front.
A.
should send
B.
must be sent
C.
be sent
D.
must go
【单选题】— _____ the soldiers are very tired, ______ they keep on working. — They are great. We must learn from them. [ ]
A.
Because; /
B.
Though; /
C.
Because; so
D.
Though; but
【多选题】When serving overseas, soldiers must learn that ________.
A.
it is natural that they can be on good terms with local population through much engagement with them.
B.
they will experience some conflict between their own culture and the values, beliefs and norms of the host culture in a new cultural environment.
C.
cultural conflict can bring about insecurity on both sides.
D.
a few lessons focusing on the cultural differences are enough for them.
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