问题：
[单选] As to the piston cooling, of the following, which statement is not true?（）
Because the piston is exposed to very high temperature, it must be cooled。The lower the piston cooling temperature is, the better it is。Both water and lube oil can be used as coolant。One of the piston cooling methods is vibration cooling, with better effect。
问题：
[单选] As to the bearing, of the following, which statement is not true?（）
ff overheat is found, the engine must be stopped for inspection。Much heat of the crankcase door indicates that the bearing is overheated。If bearing clearance is too large, knocking will be heard in the crankcase。If bearing clearance is too large or too small, the white metal may be melted。
问题：
[单选] In the combustion chamber, the part whose surface is exposed to the highest temperature is the （）.
cylinder liner。cylinder cover。piston。exhaust valve。
问题：
[单选] The hot expanding gas rotates the blades of the exhaust turbine, thus （） a large of its power, （） drives the compressor.
to give off；which。giving off；which。to give off；that。giving off；that。
问题：
[单选] （） the cylinder walls, the heat passes through them by conduction.
When receiving by。When received by。In order to receiving。In order to receive。
问题：
[单选] The development of oils （） the increasing demands made by the steady rise in powers produced by modem diesels.
has kept pace with。has kept pace to。has made pace with。has made pace to。
问题：
[单选] Cylinder wall temperature, fuel oil supplier, and oil passage （）.
are interdependent。are not interdependent。have nothing to do with each other。are independent。
问题：
[单选] Suppose the rated capacity of the main engine of a ship is 10,000 KW at 100 rated rpm, then when at 80 rpm its capacity should be （）.
800 KW。5120 KW。6400 KW。4180 KW。
问题：
[单选] The opening or closing of the cylinder starting valve is controlled by （）.
the starting air distributor。the cut-off valve on the air main。the main starting valve。the air bottle control valve。
问题：
[单选] The temperature difference between the inlet and outlet temperature of the lube oil cooler in the lubricating system for the diesel engine is generally between （）.
8-10℃。10-12℃。10-15℃。10-20℃。
