5. 11:00 由於風浪大,主機轉速從90轉減為80轉,其英文翻譯為11:00 Main engine speed reduced from 90 rpm to 80 rpm owing to a ___________.,其空格為下列何者?
(A) calm sea.
(B) moderate sea.
(C) mild sea
(D) rough sea.

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統計: A(60), B(70), C(50), D(494), E(0) #1626180

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