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【判断题】
把在故障情况下可能出现危险的对地电压的导电部分，同大地紧密地连接起来的接地称保护接地。A.
正确
B.
错误
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反馈参考答案：
举一反三
【简答题】向量的两要素是:大小和
【单选题】Suppose that the current exchange rate is £1.00 = $2.00. The indirect quote, from the U.S. perspective is
A.
£1.00 = $2.00.
B.
£1.00 = $0.50.
C.
£0.50 = $1.00.
D.
None of the above
【单选题】My father began to work ______ a bus driver when he was 20 years old.
A.
for
B.
to
C.
at
D.
as
【简答题】向量的两要素是( )和( )?
【单选题】When he was 20 years old, his dream to be a singer _____. [ ]
A.
come true
B.
achieve
C.
hold on to
D.
came true
【简答题】He a model ship out of wood when he was 20 years old.A. built
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