Cylinders of marine diesel engines are normally cooled by （

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[单选题]Cylinders of marine diesel engines are normally cooled by （）.

A. sea water
B. fine mineral oil
C. sanitary water
D. fresh water

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[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

A. Ⅰ+Ⅱ
B. Ⅰ+Ⅲ
C. Ⅱ+Ⅲ
D. 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[单选题]For one or two types of engine,the piston and rod can be withdrawn downwards from the cylinder into the crankcase and then out through （）.

A. the cylinder cover
B. the bottom of bed-plate
C. the sump
D. the crankcase door

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

A. the gases
B. the air
C. the valves
D. the injector

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