检查电雷管的工作,必须在爆炸材料贮存硐室外设有安全设施的专用房间内进行。
参考答案:错
I have _______ money than you, but I have_______ friends than you.
A.less, fewer
B.more, more
C.less, more
D.fewer, more
按压D13A,再按压S4DA,选岔网络动作规律是?继电器动作顺序是?