单选题The bow thruster generally is ineffective at（）.Aover 3 knots headwayBat any speed asternCat any speed aheadDover 1 knot sternway
单选题
The bow thruster generally is ineffective at（）.
A
over 3 knots headway
B
at any speed astern
C
at any speed ahead
D
over 1 knot sternway
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名词解释题英译汉：over speed