The cooling of the piston is carried out by circulating （） across the underside of the crown and inside the ring belt or through specially shaped passages.

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

[单选题]For diesel engine piston cooling, lubricating oil can be supplied to the pistons by a/an （）.A . oil sprayB . oil bathC . oil control ringsD . drilled passage through the camshaft

[单选题]A separate piston cooling system is used to limit any contamination （） piston cooling glands（） the piston cooling system only.A . between；toB . either；orC . from；toD . neither；nor

[单选题]A．surveywascarriedoutonthedeathrateofnew-bornbabiesinthatregion,________weresurprising.A．)asresultsB)whichresultsC)theresultsofitD)theresultsofwhich

[单选题]If business had been carried out to our satisfaction，we（）to renew the Agency Agreement.A . hadagreedB . alreadyagreedC . shallagreeD . shouldhaveagreed

[单选题]The piston rings if found worn out （） and supplied by shipchandler.A . must replaceB . must to be equippedC . has to be repairedD . have to be renewed

[单选题]The program isbeing carried out with great [zeal] by participants.A.cheerB.

[判断题]When quickly and accurately carried out， orderprocessing contributes to cus