曲线线路横断面图测量是在线路各中桩处测定（）方向的地面起伏。
A、线路的切线
B、线路中线
C、线路的法线
D、任意选定
参考答案：C
No conclusion ______about whether to tear down the old buildings for a theme park until several
discussions have been made.[ ]
A. will be reached
B. is reached
C. is being reached
D. had been reached
风烟系统中二次风的流程？
