作业人员在站内作业时,调车进路临近天窗作业区域时,()时通知下道。
A、看到机车
B、机车靠近作业人员
C、开放调车信号
参考答案:C
-I don't know about you, but I'm sick and tired of this weather.
-_______. I can't stand all this rain.
A.I don't care
B.It's hard to say
C.So am I
D.I hope not
寄生虫及其虫卵可通过下列途径危害人体。()
A、经呼吸道进入
B、病人、病畜的粪便污染水体或土壤,再污染食品
C、经口摄入
D、直接污染食品(如生食)