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單項(xiàng)選擇題

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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單項(xiàng)選擇題

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

單項(xiàng)選擇題

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
B.under oars
C.against the wind
D.with the wind