问题：
[单选] The cross-head shoes are white metal lined, grooves being cut horizontally on the face of the white metal to ensure （）.
an adequate supply of lube oil。an adequate supply of fuel oil。an adequate supply of turbine oil。an adequate supply of cylinder oil。
问题：
[单选] The cylinder and piston must be warmed up （） to a temperature of about 140 degF in standing by engine.
repeatedly。quickly。gradually。immediately。
问题：
[单选] The cylinder contains a great weight of air and is capable of burning a great quantity of fuel at（）.
the beginning of the compression stroke。the beginning of the suction stroke。the end of the working stroke。the end of the exhaust stroke。
问题：
[单选] The cylinder cover is not provided with （）.
fuel valve。lubricator。indicator valve。the starting valve。
问题：
[单选] The cylinder covers and the liners are bolted together by means of （）.
bolts welded into the cylinder head。bolts welded into the cylinder frames。studs screwed into the cylinder head。studs screwed into the cylinder frame。
问题：
[单选] The cylinder covers and the liners are bolted together by means of studs （） the cylinder frames.
screwing into。being screw on。to screw on。screwed into。
问题：
[单选] The cylinder head, cylinder liner and （） form the combustion chamber.
frame。piston。crankcase。explosion plate。
问题：
[单选] The cylinder is fitted with internal liner so that a water space is left （） the liner and the outer wall.
around。among。in。betwee。
问题：
[单选] The cylinder liners are made of （） and the cylinder surfaces are sometimes chromium-plated.
steel。copper。cast iron。stainless steel。
问题：
[单选] The cylinders, with cooling jackets, are （） to the engine frame by eight tie rods.
screwed。welded。fastened。rotated。
