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【单选题】
螺旋桨推力功率THP为__。
A.
船舶主机发出的功率
B.
指机器功率经过传动装置至螺旋桨的功率
C.
指螺旋桨获得收到的功率后,螺旋桨发出的推进功率
D.
至克服船舶阻力而保持一定船速所需要的功率
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