三相四线制的零线应采用()
A、铝线
B、铝合金线
C、铜线
D、钢线
参考答案:C
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—Fine, thank you.
A. How do you do? B. How are you? C. Are you Mr. Wang?
The use of()between bags may lead to chafe and tearing of the bags.
A.strips of burlap
B.heavy paper
C.dunnage boards
D.strips of rope yarn