This used piston had been tested and approved as a spare part by the （） during last annual repair.

[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]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]Piston No2 of main engine has been removed, and it will be （） by noon tomorrow.A . liftedB . reassembledC . dismountedD . disassembled

[单选题]hadbeentakenintoachurchwascaughtbecausetracesofwax,foundonhisclothes,_______fromthesortofcandlesusedonlyinchurches.A)hadcomeB)comingC)comeD)thatcame

[单选题]If the doctor had been available, the child ________.A.would not dieB.could

[单选题]If the doctor had been available, the child ________.A.would not dieB.could

[单选题]The rice ______ if you had been more careful.A． would not be burningB． would not burnC． would not have been burntD． would not burnt

[试题]H．ad they not been working so hard，they______(not achieve)so much.

[单选题]If Trial 4 had been extended, at approximately what time would 0.45 mL of 0 2 have reacted?A．70 secB．140 secC．240 secD．270 sec

[单选题]A． state of emergency had been in force since the emperor was overthrown.A．overtakenB．overrunC．overturnedD．overdrawn