救护中队每季度至少开展()次考核评比活动;
A.一次
B.二次
C.三次
D.四次
参考答案:A
Lose one hour in the morning ______ you will be looking for it the rest of the day. [ ]
A. but
B. and
C. or
D. so
电工指示仪表按其作用原理可分为那几类?