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【单选题】
下列不属于调距桨装置优点的是()。 a.实现无级调速、机动性好; b.动力装置经济性好; c.对船舶航行条件适应性强; d.有利于推进装置驱动辅助机械; e.主机不要换向,延长了寿命; f.在任何状态下η p 比定距桨高。
A.
b+d
B.
仅仅是b
C.
b+d
D.
仅仅是d
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