激光能被反射、透射，能在空间传播很远的距离而衰减很小，可进行远距离或难以接近部位的焊接。( )
参考答案：对
—It smells terrible. What has happened here?
—Look, there is much waste gas _____ from the chemical factory. [ ]
A. pour
B. pouring
C. poured
D. pours
一条发车进路由两条进路组成时，正确的办理方法是。
A.先办理远端进路，再办理近端进路
B.先办理近端进路，再办理远端进路
C.同时办理两条进路
