单项选择题
（）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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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 -
单项选择题
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
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If the bedplate was too rigid, then as the hull flexed, the （）, which secure the engine into the ship would be likely to break, and there would be a danger of the bedplate cracking.
A.through bolts
B.jack bolts
C.holding down bolts
D.tap bolts
