FW7—10/400代表的是（）开关。
A、柱上多油式；
B、柱上真空式；
C、柱上六氟化硫式；
D、柱上负荷闸刀。
参考答案：D
青光眼患者禁用的药物
A．右美沙芬B．可待因C．退嗽D．咳快好E．咳必清
The factory which I visited yesterday was not the one I once worked. [ ]
A. where
B. which
C. what
D. that
