把钩工在串车进出车场时,应目接目送串车,并与信号工配合默契,以便做好随时发出停车信号的准备。
参考答案:对
Whenever he was asked why he was late for class,he would answer carelessly,______ the same thing.
A.saying
B.said
C.to say
D.say
速效、短效的镇痛药是()
A.美沙酮
B.吗啡
C.哌替啶
D.曲马朵
E.芬太尼