Leg penetration to depths which require pullout forces greater than that which can be supplied by the buoyancy of the hull may exist in（）.

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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