路面上的白色标线是何含义?()
A.车行道横向减速标线
B.道路施工提示标线
C.车行道纵向减速标线
D.车道变少提示标线
参考答案:A
在抽放容易自燃和自燃煤层的采空区瓦斯时,为什么要特别注意自然发火征兆?
Although manual plotting for CPA works well,the workload can become overwhelming when confronted with().
A.one target
B.two targets
C.three targets
D.a large number of targets