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【单选题】
普通货船空载时,其螺旋桨轴至水面的高度I与螺旋桨的直径D之比小于________时,螺旋桨的推进效率将急剧下降。 (40603:第三章_吃水差:1054)A.
30%~40%
B.
40%~50%
C.
50%~60%
D.
65%~75%
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A.
By pointing to the desk
B.
By saying desk is “书桌”
C.
By saying desk is something that we can read and write on.
D.
By saying desk has a flat surface with four legs.
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