公路隧道的常见质量问题有______。
A．洞内渗漏 B．衬砌裂缝 C．路面翻浆 D．限界受侵
参考答案：A,B,D
----Have all the students known that our class will visit the factory this afternoon?
----Yes. Every student______about it.
A．told
B．has told
C．was told
D．tells
哪些信号、仪表，如果指示有电，则禁止在设备上工作？
