如果车厢两侧都不靠站台，应选择无车通过的车门装卸，无此条件的，应当派人值守，注意信号及来往火车。
参考答案：对
It was the belief _____ Alex Haley could find his “root” in Africa______ made him decide to go to Gambia.
A．that; which
B．which; which
C．that; where
D．that; that
有关锁骨下动脉的描述错误的是（）
A.是上肢动脉的主干
B.左锁骨下动脉直接起于主动脉弓
C.右锁骨下动脉起于头臂干
D.右锁骨下动脉直接起于主动脉弓
E.主要分支有椎动脉
