The purpose of treating the cooling water of the diesel engine is to____. I、 resist the scale formation in the cooling chamber II、 lubricate the engine part III、 increase thermal capacity IV、 resist corrosion

A．I +II

B．II + III

C．III + IV

D．I +IV

[单选题]The purpose of treating the cooling water of the diesel engine is to______. I、 resist the scale formation in the cooling chamber II、lubricate the engine part II III、increase thermal capacity IV、 resist corrosionA．I + IIB．II + IIIC．III + IVD．I + IV

[单选题]The water level showing in a boiler water gauge glass is usually ( ) duringworking.A．higher than the actual drum water levelB．equal to the actual drum water levelC．increasing due to steam condensation in the glassD．lower than actual drum wafer level

[单选题]The doctor is skilled at treating heart trouble and never accepts any gift from his patients, so he has a very good_____.A． expectationB． reputationC． contributionD． civilization

[单选题]The cylinders, with cooling jackets, are （） to the engine frame by eight tie rods.A . screwedB . weldedC . fastenedD . rotated

[单选题]As to the piston cooling, of the following, which statement is not true?（）A . Because the piston is exposed to very high temperature, it must be cooledB . The lower the piston cooling temperature is, the better it isC . Both water and lube oil can be

[单选题]The purpose of the writing is to ______.A． promote scenic spots in Canada B. advertise for the sports in BanffC． introduce tourist activities in Banff D. describe breathtaking views in Banff

[单选题]The purpose of the memo is toA．attract students’interest in the programmeB．require the parents to select a sport for their chinldC．help the staff explain the programme to the parentsD．remind teachers and lifeguards to be present on time

[单选题]Piston cooling fins are locatedA．atop the piston crownB．beneath the piston crownC．at the base of the piston skirtD．inside the cylinder liner cooling water jacket

[单选题]The cooling liquid used for the cylinder may be referred to as _____.A．jacket waterB．make-up waterC．boiler waterD．flushing water

[单选题]（） is sometimes used for piston cooling since leaks into the crankcase would not cause problems.A . Diesel oilB . Hydraulic oilC . Lube oilD . Mineral oil