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
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相关考题
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单项选择题
Hygroscopic cargoes should be ventilated when（）.
A.going from a warm to a cold climate
B.the dew point of the outside air is greater than the dew point of the air in the hold
C.the dew point of the air in the hold is very low
D.the outside dew point is 16℃ and the cargo temperature is 12℃ -
单项选择题
How do you dispose（）the general cargo in the fore part of Hatch No.5?
A.at
B.to
C.of
D.with -
单项选择题
Green lights may appear on（）.
A.horizontally banded buoys
B.vertically striped buoys
C.yellow buoys
D.spherical buoys
