单项选择题

An effective braking system for windlasses on rigs in deep water is a(n)（）.

A.larger chain stopper
B.disc backstopping brake
C.hydraulic clutch
D.electrical regenerative braking system

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单项选择题

A wooden plug fitted tightly in the vent of a damaged tank may prevent the tank from（）.

A.filling completely
B.developing free surface
C.developing free surface moment
D.collapsing

单项选择题

A tackle is two blocked when the blocks are（）.

A.equally sharing the load
B.jammed together
C.as far apart as possible
D.rove to the highest mechanical advantage

单项选择题

A sweep oar is an oar that is（）.

A.generally shorter than the others and is used to steer with
B.is longer than the others and is used as the stroke oar
C.is raised in the bow of the boat for the steersman to steer by
D.longer than the others used for steering