防护层站门口发生坠落危险的部件有门扇、层门自闭装置、门电气联锁和()。
A.门锁
B.门头
C.门靴
D.门导轨
参考答案:A
--- How is the _______ in Hangzhou ?
--- Awful. There are always long lines of cars on roads .
A.culture
B.food
C.weather
D.traffic
路面基层的类型有( )。
A.填石路基
B.水泥稳定土基层
C.级配碎石基层
D.砌石路基
E.填隙碎石基层