單項選擇題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.prevent to touch with other vessels
C.make a convenience of cargo discharging


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2.單項選擇題Jettisoning weight from topside().

A.return the vesselto an even keel
B.reduces free surface effect
C.lowers the center of gravity
D.raises the center of buoyancy