管内工作车
参考答案：
是指在铁路局、分局管内卸车的重车（包括自装自卸、接入自卸）。
—______ go to the Great Wall this Sunday?
—I’m afraid it is not a good idea. Many of us have been there.
A．Why not
B．What about
C．Would you like
D．You’d better
当在运行中无法判断汽包确实水位时，应（）停炉。
A、请示
B、紧急
