單項選擇題

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

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單項選擇題

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

單項選擇題

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