单项选择题
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
D.If bearing clearance is too large or too small, the white metal may be melted
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相关考题
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单项选择题
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 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 -
单项选择题
The essential part of the diesel engine, whose function is to convert the heat energy into the mechanical power, is the （）.
A.crankshaft
B.piston
C.connecting rod
D.bearing -
单项选择题
Among the main propulsion units on board the ship with the same capacity, the lightest one is（）.
A.steam engine
B.steam turbine
C.gas turbine
D.diesel engine
