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单选题
在无流海域，冰山的漂移速度约为风速的（）
A
1/2
B
1/3
C
1/10
D
1/50
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moor your vessel at the nearest dock available and arrange for repairs to the systemC
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the station bill is posted in each compartmentB
temporary personnel and visitors are advised of emergency stationsC
names of crew members are listed on the station billD
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逐渐减少C
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