单项选择题
The hot expanding gas rotates the blades of the exhaust turbine, thus （） a large of its power, （） drives the compressor.
A.to give off；which
B.giving off；which
C.to give off；that
D.giving off；that
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In the combustion chamber, the part whose surface is exposed to the highest temperature is the （）.
A.cylinder liner
B.cylinder cover
C.piston
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As to the bearing, of the following, which statement is not true?（）
A.ff overheat is found, the engine must be stopped for inspection
B.Much heat of the crankcase door indicates that the bearing is overheated
C.If bearing clearance is too large, knocking will be heard in the crankcase
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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 cooled
B.The lower the piston cooling temperature is, the better it is
C.Both water and lube oil can be used as coolant
D.One of the piston cooling methods is vibration cooling, with better effect
