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问题
单项选择题
LGJ-50是截面为50mm
2
的()。
A.铝绞线
B.钢绞线
C.加强型钢芯铝绞线
D.钢芯铝绞线
答案
参考答案:D
填空题
双臂电桥的用途:()。
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选择题
The opening province which ____ thirteen counties and three coastal cities will quicken its paces of economic development.
A.consists of
B.makes up
C.is included
D.is contained
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