Deck : Deck General - 4533/5076
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| Small floes of rough, hummocky sea ice capable of damaging a vessel __________. |
| A) are usually seen at night before they are close enough to provide a radar echo |
| B) are indistinguishable from sea return on the PPI |
| C) are invisible to radar when covered with a thick layer of snow |
| D) can usually be detected by radar in a smooth sea at a range of 4 to 6 kilometers |
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