航线规划一般分两步：首先是飞行前（）其次是飞行中（）
A.预先规划，在线规划
B.预先规划，实时规划
C.预规划，重规划
参考答案：C
— Would you like to go to the cinema with me this evening?
— I’d like to, but I won’t be free tonight. Let’s make ____ some other day.
A．it
B．them
C．you
D．this
岩巷掘进施工安全注意事项有哪些？
