单项选择题
In the constant-tension mooring, the mooring lines holding the ship to the pier will maintain a constant tension even with changes in tide or ship’s draft, （）.
A.without the necessity of manually adjusting the lines
B.without the necessity of automatically adjusting the lines
C.with the necessity of manually adjusting the lines
D.with the un-necessity of automatically adjusting the lines
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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 -
单项选择题
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
D.cylinder block
