单项选择题
A.make B.cause C.result D.produce
Cooling of engine is achieved by circulation a cooling ...
单项选择题Cooling of engine is achieved by circulation a cooling liquid around internal passages within the （）.
A.boiler B.heater C.engine D.cooler
Cooling enables the engine metals （） their mechanical p...
单项选择题Cooling enables the engine metals （） their mechanical properties.
A.to retain B.to remain C.to maintenance D.to have
Constant cooling the various components of diesel engin...
单项选择题Constant cooling the various components of diesel engine has a number of functions except for （）.
A.good lubrication B.low thermal stress C.good mechanical properties D.acid corrosion
