冠心病患者在什么天气时更易发生心绞痛（）
A.干燥
B.潮湿
C.炎热
D.寒冷
E.湿热
参考答案：D
— Why are you late?
— Because my bike _____ on the half way.[ ]
A. broke up
B. broke down
C. broke on
电压互感器、电流互感器在哪些情况下应立即停电处理？
