答案:B
—Can you give some advice on what I said just now?
—Sorry. My mind______________.
A.is wandering
B.was wandering
C.has wandered
D.had wandered
沿用带电作业规程的习惯工频过电压倍数一般取()。
A.1.2;
B.1.5;
C.1.3;
D.1.6。