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

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A swift current occurring in a narrow passage connecting two large bodies of water，which is produced by the continuously changing difference in height of tide at the two ends of the passage，is called a（）.

A.hydraulic current
B.rectilinear current
C.rotary current
D.harmonic current

单项选择题

A survival craft being used to pick up a person who has fallen overboard from a ship should approach the person（）.

A.at a high rate of speed
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A sufficient amount of chain must be veered when anchoring a vessel to ensure（）.

A.the vessel has enough room to swing while at anchor
B.the anchor flukes bite into the ocean bottom
C.there is a sufficient scope of chain to keep the anchor on the bottom
D.there is more chain out than there is in the chain locker