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【单选题】
单相桥式整流电路输出电压的波形为 ( )。A.
正弦波
B.
三角波
C.
单向半波 脉动波
D.
单向 脉动波
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【简答题】福州是福建的省会城市,别称( )
【单选题】---You are sweating. ______ I fetch you some water? ---It’s so kind of you.
A.
Can
B.
Must
C.
Shall
D.
Need
【单选题】—Can you fetch me some water? — _____________. [ ]
A.
It's a pleasure
B.
With pleasure
C.
My pleasure
D.
Don't say so
【简答题】there any water in the kettle? No, please fetch some.
【简答题】保护继电器按其组成元件分,有 、晶体管型和 等。
【单选题】To fetch water before breakfast seemed to be a rule ___________.
A.
to never break
B.
never to be broken
C.
never to have broken
D.
never to be breaking
【单选题】They found that the villagers fetch water from a dirty pond as there was no clean water available.
A.
wanted
B.
were able to
C.
were
D.
had to
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