正确答案: D

4

题目：到目前为止，船舶机械的维修方式有( )种

解析：D

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举一反三的答案和解析：

[单选题]Sanitary waste matter will .(1)pass through a screen or cutters (2)come into contact with the bacteria in a tank (3)be discharged, normally without bacteria

(1)(2)(3)

[单选题]A segregated ballast system is a system where

all ballast lines, tanks, and pumps are independent of those used for oil

[单选题]泵的扬程是指单位重液体通过泵后所增加的能量，其单位是( )。

米

解析：C　

[单选题]在海面有油火的情况下跳水脱险前应判明：

风向