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High firing pressures and low exhaust temperature in a diesel engine may resultfrom().

A. decreased piston to cylinder head clearance
B. increased exhaust system back pressure
C. early fuel injection timing
D. low scavenge air temperature

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(piston area)×(piston stroke)×(numbers of the cylinders)=engine().

A. brake horsepower
B. displacement
C. cylinder volume
D. cylinder clearance

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某产品的实际成本是2000元，目标成本是1800元，其各个部件的功能指数及成本指数见表9-7，部件A、B、C的成本改进期望值应分别为()元。

A. 60，60，80
B. 74，56，70
C. 200，20，－20
D. 140，－40，－100

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If the coolant temperature of a closed cooling water system for a diesel enginegradually increases, the trouble usually is().

A. a broken shaft on the freshwater pump
B. an excessive accumulation of scale in the heat exchanger
C. an incorrect thermostatic element operating range
D. lube oil in the cooling water

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在进行产品功能价值分析时，若甲、乙、丙、丁四种零件的价值系数分别为V甲＝0．5，V乙＝0．8，V丙＝1，V丁＝1．2，则应重点研究改进的对象是零件()。

A. 甲
B. 乙
C. 丙
D. 丁

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High firing pressures and low exhaust temperature in a diesel engine may resultfrom().

A. decreased piston to cylinder head clearance B. increased exhaust system back pressure C. early fuel injection timing D. low scavenge air temperature

(piston area)×(piston stroke)×(numbers of the cylinders)=engine().

某产品的实际成本是2000元，目标成本是1800元，其各个部件的功能指数及成本指数见表9-7，部件A、B、C的成本改进期望值应分别为()元。

If the coolant temperature of a closed cooling water system for a diesel enginegradually increases, the trouble usually is().

在进行产品功能价值分析时，若甲、乙、丙、丁四种零件的价值系数分别为V甲＝0．5，V乙＝0．8，V丙＝1，V丁＝1．2，则应重点研究改进的对象是零件()。

A. decreased piston to cylinder head clearance
B. increased exhaust system back pressure
C. early fuel injection timing
D. low scavenge air temperature