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【单选题】
两个正弦交流电流的瞬时表达式为:i1=10sin(314t+30°)A,i2=15sin(314t+45°)A。这两个式子中相同的物理量是( )A.
最大值
B.
有效值
C.
初相位
D.
周期
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举一反三
【简答题】Mr. White works in an office. He’s able and can easily deal with all kinds of matters. 60 . Of course he’s often busy and has no time to do the housework. His wife does all at home. Last Friday, ...
【单选题】It will be long she sees Mr. White again at Beijing, business has just started in Switzerland.
A.
It will be long____she sees Mr. White again at Beijing, ____business has just started in Switzerland. A．after; who
B.
since; who
C.
when; whose
D.
before; whose
【单选题】The man ________ Mr. White. He has gone abroad.
A.
can be
B.
doesn't have to be
C.
mustn't be
D.
can't be
【单选题】—Is that man Mr. White? —It ______be him. He has gone to London on business.
A.
may not
B.
needn’t
C.
can’t
D.
mustn’t
【单选题】. Mr. White has been invited to the celebration _________ tomorrow afternoon.
A.
held
B.
being held
C.
to be held
D.
to hold
【简答题】It can be learned from the passage that we may have ______ to work on the big project we are undertaking if someone else gets the knowledge about what were doing.
【单选题】The reform project ______ by Mr. White ______ at the meeting now.
A.
put forward, is discussed
B.
has been put forward, is being discussed
C.
is put forward, is discussed
D.
put forward, is being discussed
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