正确答案: D

fresh water

题目：Cylinders of marine diesel engines are normally cooled by （）.

查看原题 查看所有试题

学习资料的答案和解析：

[单选题]尾轴锥形轴段出现裂纹的主要原因是（）。Ⅰ.疲劳；Ⅱ.振动；Ⅲ.撞击

Ⅰ+Ⅱ+Ⅲ

[单选题]For one or two types of engine,the piston and rod can be withdrawn downwards from the cylinder into the crankcase and then out through （）.

the crankcase door

[单选题]The rim of the piston may contain cut-out portions to accommodate （） when they open.

the valves