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【单选题】
将复数z=-5i化为三角形式是A.
-5（cos +isin ）
B.
5(cos +isin )
C.
5[cos(- )+isin(- )]
D.
5[cos(- )-isin（- ）]
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反馈参考答案：
举一反三
【单选题】Once telling him the truth, _____.
A.
he will be nervous all the time
B.
you will find him nervous all the time
C.
he will find himself nervous all the time
D.
everyone will find him nervous all the time
【简答题】对 462进行质因数分解
【单选题】The police went there the missing boy last week. At last they found him and brought him home safe.
A.
in charge of
B.
in search of
C.
in honor of
D.
instead of
【单选题】______going to the exhibition.
A.
All but him and me is
B.
All but him and me are
C.
All but he and I are
D.
All but he and I am
【单选题】The professor demanded that all the essays ________ to him by Jan. 10 th .
A.
hand in
B.
be handed in
C.
should hand in
D.
were handed in
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