题目内容

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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某企业给产品上涂料时，涂料的溶剂是易燃品，原计划采用石棉板做防火材料，经市场调查决定用防火纸代替石棉板能起同样的防火效果，成本降低了40％。根据价值工程原理，这体现了提高价值的途径是()。

A. 功能提高，成本不变
B. 功能不变，成本降低
C. 功能提高，成本降低
D. 功能和成本都降低，但成本降低幅度更大

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Accidental flooding of the engine room bilges by the bilge main is prevented by().

A. stop-check valves installed in the bilge suction manifolds
B. using a positive displacement reciprocating bilge pump
C. installing educators in all bilge rose boxes
D. installing a swing check before each bilge valve

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Which of the following firing order may be used for a 6-cylinder engine？ ()

A. 1-2-3-4-5-6
B. 1-2-3-6-5-4
C. 1-5-3-6-2-4
D. 1-3-4-5-6-2

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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

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()。

某企业给产品上涂料时，涂料的溶剂是易燃品，原计划采用石棉板做防火材料，经市场调查决定用防火纸代替石棉板能起同样的防火效果，成本降低了40％。根据价值工程原理，这体现了提高价值的途径是()。

Accidental flooding of the engine room bilges by the bilge main is prevented by().

Which of the following firing order may be used for a 6-cylinder engine？ ()

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