导线截面的选择一般有()方法。
A.按允许载流量选择
B.按经济电流密度选择
C.按允许电压损失选择
D.按机械强度校验导线截面
参考答案:A, B, C, D
When you phoned me, I was having a meeting; otherwise I _______ your call. [ ]
A. answered
B. would answer
C. had answered
D. would have answered
钉洞固位形直径一般为()
A.0.5mm
B.1.0mm
C.1.5mm
D.1.8mm
E.2.0mm