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
更多“Small floes of rough，hummocky sea ice capable of damaging a vessel（）.”相关的问题
A、High-speed operation and rough handling of hatches are dangerous. B、Low-speed operation and rough handling of hatches are dangerous. C、Low-speed operation and rough handling of hatch covers are dangerous. D、High-speed operation and rough handling of hatch covers are dangerous.
A、3 knots in smooth water B、6 knots in smooth water C、3 knots in rough water D、6 knots in rough water
A、Roughly 50 percent B、Roughly 66 percent ActualTests.com C、Roughly 75 percent D、Roughly 10 percent
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