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【单选题】
我国安全电压是 36V , 在特别潮湿的场所,应采用 ( ) V 以下的电压。A.
12V
B.
24V
C.
36V
D.
48V
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【简答题】Two examples should (2) be enough to explain the point.
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【简答题】电阻焊是焊件组合后通过电极施加______,利用电流通过接头的______及邻近区区产生______电阻热进行焊接的方法。
【简答题】电阻焊是工件组合后通过电极施加（），利用电流流过接头的接触面及邻近区域产生的（）进行焊接的方法。
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【简答题】Wang Yani was born in 1975.Even as a baby she loved to draw. Her father was an . Yani wanted to be like him. So she tried to stand like her father as he painted,which made him laugh. One day,Yani pain...
【简答题】Two examples should be enough to explain the point.
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