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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A.filling completely
B.developing free surface
C.developing free surface moment
D.collapsing -
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A tackle is two blocked when the blocks are（）.
A.equally sharing the load
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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
