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

1.19 If a better material had been used the efficiency of the machine ( ) much i

[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

翻译题 It has been tested that plastics tend to be resistant to these acids。A. 转移B.

the plastic-|||-vhich had been used for bottles since-|||-he 1960s,suitable for

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

[单选题]Some of his suggestions had been rejected ______ they were not practicable.A． asB． whenC． untilD． if