单选题（）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.AThe large-tension mooringBThe small-tension mooringCThe variable-tension mooringDThe constant-tension mooring
单选题
（）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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