单项选择题
Leg penetration to depths which require pullout forces greater than that which can be supplied by the buoyancy of the hull may exist in（）.
A.soft mud
B.sand
C.silt
D.soft to firm clays
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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 -
单项选择题
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（）.
A.under sail
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C.restricted in her ability to maneuver
D.engaged in pilotage duty
