运行中交流滤波器组数不满足绝对最小滤波器组数会出现下列哪些现象()。
A.中央报警
B.事件记录
C.故障录波启动
D.功率回降
参考答案:A, B, C, D
— What did you do yesterday?
— My brother took two friends of ______ to play chess with us. But I don't know ______ of them. [ ]
A. his; all
B. him; both
C. his; either
D. him; neither
速效散功效与作用