正确答案: A

疲劳、磨损、老化

题目：造成产品耗损故障期的主要原因是（）。

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学习资料的答案和解析：

[单选题]备车和机动操纵对柴油机动力装置的（）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

Ⅰ+Ⅱ+Ⅲ+Ⅳ

[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.

plays an important part in

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

should be correctly carried out

[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?（）

An electromagnetic brake will hold the load where it is suspended