单选题Before entering an ice area，the ship should be（）.Aeither trimmed by the head or the sternBon an even keelCtrimmed down by the headDtrimmed down by the stern
单选题
Before entering an ice area，the ship should be（）.
A
either trimmed by the head or the stern
B
on an even keel
C
trimmed down by the head
D
trimmed down by the stern
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