单项选择题
If a hydraulic pump on a winch accidentally stops while hoisting，the load will stay suspended because（）.
A.a check valve will close that prevents reverse circulation B.a centrifugal counterweight counteracts the force of gravity C.the electric pump motor will cut out D.the control lever will move to the stop position
单项选择题 Hygroscopic cargoes should be ventilated when（）.
单项选择题 How do you dispose（）the general cargo in the fore part of Hatch No.5?
单项选择题 Green lights may appear on（）.
