（）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.<br>A:The large-tension mooring<br>B:The small-tension mooring<br>C:The variable-tension mooring<br>D:The constant-tension mooring

（）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

出自：海船船员证

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