单选题For operations in pack ice，a vessel should（）.Abe on an even keelBbe trimmed slightly by the headChave a drag of not more than 60 - 90 centimetersDbe ballasted so the forefoot is near the surface
单选题
For operations in pack ice，a vessel should（）.
A
be on an even keel
B
be trimmed slightly by the head
C
have a drag of not more than 60 - 90 centimeters
D
be ballasted so the forefoot is near the surface
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