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搜题
【单选题】
已知某一电流的复数式I=(5-j5)A,则其电流的瞬时表为( )。A.
i =5sin(ωt-π/4)A
B.
i =5 sin(ωt+π/4) A
C.
i =10sin(ωt-π/4) A
D.
i = 5 sin (ωt-π/4) A
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举一反三
【单选题】We don’t have to ________ every word that we don’t know when reading.
A.
look up
B.
refer to
C.
look for
D.
look into
【多选题】关于库存现金的清查表述正确的有( )。
A.
在进行现金清查时,出纳员必须在场
B.
在清查过程中不能用白条抵库
C.
库存现金盘点报告表不是原始凭
D.
库存现金盘点报告表应由监盘人员、出纳人员及其相关负责人签名盖章
【单选题】Don’t be afraid of new words. You can ______ in the dictionary.
A.
look at them
B.
look for them
C.
look them up
D.
look them over
【单选题】—You don't look well. What's the matter? —I _______ sleep well. [ ]
A.
don't
B.
didn't
C.
won't
D.
haven't
【单选题】They _____ look the same, _____ they’re good friends.
A.
don’t ;and
B.
don’t;but
C.
aren’t;but
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