Cooling makes the engine metals their

1、Modem engines make use of exhaust gas

Modem engines make use of exhaust gas driven turbo-chargers to supply pressurized fresh air for （） and supercharging.AscavengingBstartingCcoolingDblowing

2、（）, the metal expands.

（）, the metal expands.AHeatsBHeatingCTo heatDHeated

3、In a diesel engine cooling water syste

In a diesel engine cooling water system, a pH of 60 indicates a/an （）.Aslightly acidic conditionBslightly alkaline conditionCovertreatment of waterDneutral condition of water

4、The cooling water of the diesel engine

The cooling water of the diesel engine should be treated, because it has（）Aalkale scenceBacidityCsalinityDimpurity

5、Cooling of engine is achieved by circu

Cooling of engine is achieved by circulation a cooling liquid around internal passages within the （）.AboilerBheaterCengineDcooler

6、Cooling （） the engine metals retain th

Cooling （） the engine metals retain their mechanical properties.AforcesBenablesCmakesDis able to