F．or the Wartsila 50DF, the complete combustion compared with the lean-combustion can decrease the following results ____ .①Exhaust temperatures ②NOx emissions ③Propeller efficiency ④Output ⑤Cylinder knocking ⑥Fuel supply

A．①②

B．③⑥

C．④

D．④⑤

[单选题]第一组： The Wartsila 50DF operates on the lean-bum principle: the mixture of air and gas in the cylinder has more air than is needed for complete combustion. Lean combustion reduces peak temperatures and therefore NOx emissions. Efficiency is increased

[名词解释] complete stroke

[单选题]When the fuel oil is burning in the combustion chamber, it _____.A．gives up large amount of heatB．gives off large amount of heatC．gives up large amount of steamD．gives off large amount of steam

[单选题]When the fuel oil is burning in the combustion chamber, it （）.A . gives up large amount of heatB . gives off large amount of heatC . gives up large amount of steamD . gives off large amount of steam

[问答题] 程序图中1DF，2DF、3DF、DFI、DF2、DF3、DF4、DF5、DF7、DF8及DF9等符号的含义是什么？

[多选题] COMB单板支持哪些客户业务？（）A . GEB . STM-16C . STM-64D . E1

[单选题]Which statement about diesel engine combustion is true?（）A . Combustion does not begin until the piston starts down on the power strokeB . Maximum combustion pressure is reached before TDCC . Turbulence in the cylinder causes a delay in ignitionD . M

[主观题]The house is _to be completed_ (complete) before his brother’s wedding ceremony.

[单选题]The complete database application can be divided into three major categories：data presentation．businesslogic，and data______．A．storageB．statisticsC．disposeD．analysis

[名词解释] 完全流产(complete abortion)