单选题The keel is a ship’s centerline. （）A船舶的中线是艉甲板。B肋骨是船舶的中线。C龙骨是船舶的中线。D船舶的中线是正横。
单选题
The keel is a ship’s centerline. （）
A
船舶的中线是艉甲板。
B
肋骨是船舶的中线。
C
龙骨是船舶的中线。
D
船舶的中线是正横。
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