造成产品耗损故障期的主要原因是（）。

【名词&注释】

经济性(economy)、使用寿命(service life)、不合适(inconcinnity)、直接影响(directly affect)、柴油机动力装置(diesel power plant)

[单选题]造成产品耗损故障期的主要原因是（）。

A. 疲劳、磨损、老化
B. 设计、制造上的缺陷
C. 使用中磨合不合适
D. 操作管理不当

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学习资料：

[单选题]备车和机动操纵对柴油机动力装置^{(diesel power plant)}的（）直接影响。Ⅰ.可靠性；Ⅱ.经济性；Ⅲ.维修性；Ⅳ.使用寿命；Ⅴ.操纵技能

A. Ⅰ+Ⅱ+Ⅲ+Ⅴ
B. Ⅰ+Ⅱ+Ⅲ+Ⅳ
C. Ⅱ+Ⅲ+Ⅳ+Ⅴ
D. Ⅲ+Ⅳ+Ⅴ

[单选题]The film of oil between the rings and the liner is not only essential for the lubrication but also （） achieving a gas seal.

A. play a great part on
B. run a role in
C. plays an important part in
D. acts as important part at

[单选题]To avoid scavenge fires occurring the engine timing and equipment maintenance （）.

A. should be correctly carried out
B. should correctly be taken place
C. should carded with care
D. must to carry out with great care

[单选题]If an electric cargo winch is being used to lift a draft of cargo and the engine room loses all power，which will occur?（）

A. A pawl，forced by a spring mechanism，will engage the teeth of the bull gear and hold the load
B. An electromagnetic brake will hold the load where it is suspended
C. The load will fall rapidly to the deck unless the foot brake is engaged
D. The load will slowly lower to the deck under control of the drag of the winch motor

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