单项选择题

（）conveys a signal of desired rudder angle from the bridge and activates the power unit and transmission system unit the desired angle is reached.

A.The control equipment
B.The power unit
C.The transmission system
D.The follow-up mechanism

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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

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