矿用防爆电气设备的总标志为（）；矿用安全标志是（）。
参考答案：Ex、MA
Everybody wants to go to Mount Huang, _____ Lisa, who has gone there before.[ ]
A. besides
B. without
C. except
D. as for
电压互感器、电流互感器在哪些情况下应立即停电处理？
