蝶形光缆通过墙面开孔入户，使用（）电锤钻孔。
A、Φ6mm
B、Φ8mm
C、Φ10mm
D、Φ12mm
参考答案：B
We decided ______ at home. It was raining heavily. [ ]
A. stay
B. stayed
C. to stay
D. staying
运用机车电空接触器触头开距应为（）毫米。
A.15—20
B.26—28
C.27—30
D.25—33
