单项选择题

Topside icing decreases vessel stability because it is usually off-center and（）.

A.increases displacement
B.increases the height of the center of gravity
C.increases draft
D.reduces the pocketing of free surface

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The proximity of pack ice may be indicated by（）.

A.changes in seawater salinity
B.glare on clouds on the horizon
C.changes in air temperature
D.icebergs

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Small floes of rough，hummocky sea ice capable of damaging a vessel（）.

A.can usually be detected by radar in a smooth sea at a range of 4 to 6 kilometers
B.are indistinguishable from sea return on the PPI
C.are invisible to radar when covered with a thick layer of snow
D.are usually seen at night before they are close enough to provide a radar echo

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On a twin-screw，twin-rudder vessel，the most effective way to turn in your own water，with no way on，is to put（）.

A.one engine ahead and one engine astern，with full rudder
B.one engine ahead and one engine astern，with rudders amidships
C.both engines ahead，with full rudder
D.both engines astern，with full rudder