Small floes of rough，hummocky sea ice

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

Acan usually be detected by radar in a smooth sea at a range of 4 to 6 kilometers
Bare indistinguishable from sea return on the PPI
Care invisible to radar when covered with a thick layer of snow
Dare usually seen at night before they are close enough to provide a radar echo

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参考解析：

分类：狭水道、冰区与运河航行题库

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