单项选择题

It is sometimes necessary to moor bow and stern to two mooring buoys in order to（）.

A.avoid any swing in a restricted space
B.shelter the ship from strong winds
C.prevent from touching with other vessels
D.make a convenience of cargo discharging

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Installing tandem anchors on the same mooring line is referred to as（）.

A.doubling
B.pretensioning
C.piggybacking
D.paralleling

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In a crossing situation，a vessel fishing must keep out of the way of a vessel which is（）.

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In a combination chain and wire rope mooring system，the anchor chain is deployed at the anchor end of the line to（）.

A.increase fatigue life of the system
B.reduce the time to retrieve the line
C.increase the holding power
D.reduce the catenary