单项选择题
A.Hot bearing B.Starting valves C.Unequal distribution of load D.Excessive crankshaft clearance
（） is used for cylinder and cylinder head, the salt wat...
单项选择题（） is used for cylinder and cylinder head, the salt water is used for cooling the lubricating oil, the fresh water in the coolers and the charging air in the air cooler.
A.The fuel oil B.The lube oil C.The sea water D.The fresh water
（） is the removal of exhaust gases by blowing in fresh ...
单项选择题（） is the removal of exhaust gases by blowing in fresh air.
A.Gas exchange B.Charging C.Scavenging D.Supercharging
（） is sometimes used for piston cooling since leaks int...
单项选择题（） is sometimes used for piston cooling since leaks into the crankcase would not cause problems.
A.Diesel oil B.Hydraulic oil C.Lube oil D.Mineral oil
