皮皮学，免费搜题
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【单选题】
我国规定安全电流为30mA(50Hz交流),但触电时间不超过( )。A.
0.5S
B.
1mS
C.
100mS
D.
1000mS
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【单选题】Which sentence is right?
A.
Although she knew that it was dangerous, but she walked home by herself.
B.
My knee started hurting, I stopped running.
C.
Since we've got a few minutes to wait for the train, let's have a cup of coffee.
D.
She bought the whole lot-house and farm and horses and all.
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