预防雷击电磁脉冲,是指在雷击中,预报线路中的哪些情况?()
A.过电流
B.过电压
C.感应电流
D.感应电压
E.电磁干扰
参考答案:A, B
I didn't go to bed ________ I finished my math homework yesterday evening. [ ]
A. when
B. because
C. until
D. as soon as
下列药品中,新生儿局部应用过多可能导致中毒的是()。
A.硼酸
B.氧化锌
C.甘油溶液
D.炉甘石
E.滑石粉