單項(xiàng)選擇題

（）is put into use in the late years to maintain a preset tension in a mooring line after a ship has been tied up at a pier.

A.The large-tension mooring
B.The small-tension mooring
C.The variable-tension mooring
D.The constant-tension mooring

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單項(xiàng)選擇題

However fast or slow the combustion rate, it is still a （） between carbon, hydrogen, sulphur and oxygen that releases heat.

A.physical deformation
B.state exchange
C.chemical reaction
D.coalescence

單項(xiàng)選擇題

The trend nowadays is to build the frame box as a separate fabricated construction and then, after stress relieving and machining the mating surfaces, to mount it on the （）.This has the advantage of saving weight.

A.seating
B.bedplate
C.entablature
D.cylinder block

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