向封锁区间发出路用列车的行车凭证是调度命令。
参考答案：对
Which do you feel like ________ the time on the train, chatting with friends or just reading something?
A．killing
B．to share
C．to kill
D．sharing
焊接低碳钢时，低氢钠型焊条E4315（J427）的脱渣性（）
A.最好
B.最差
C.较差
D.较好
