非自动闭塞区段,出站兼调车信号机,显示一个白色灯光,准许越过该信号机()。
A.发车
B.停车
C.调车
D.装卸车
参考答案:C
对于高强混凝土,因其运动黏度较大,塌落度需要达到()以上才能保证顺利施工。
A.120mm
B.140mm
C.160mm
D.180mm
How could lashing gear used aboard Ro-Ro vessels be stowed when not in use?()
A.Drape along brackets
B.Hang vertically in a sheltered area
C.Stow in bins at hatch coming side
D.All of the above