要求机座全部底脚螺栓中的（）以上的螺栓采用紧配螺栓，以防机座

【名词&注释】

可靠性(reliability)、工作时间(working time)

[单选题]要求机座全部底脚螺栓中的（）以上的螺栓采用紧配螺栓，以防机座移位。

A. A．10%
B. B．15%
C. C．20%
D. D．25%

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学习资料：

[单选题]串联系统的部件数目n与工作时间t都影响系统的可靠性（）。Ⅰ.串联部件越多，系统可靠性越差；Ⅱ.工作时间越长，系统的可靠性越差

A. 仅Ⅰ对
B. 仅Ⅱ对
C. Ⅰ，Ⅱ都对
D. Ⅰ，Ⅱ都不对

[单选题]The space between cylinder liner and jacket is called （）.

A. the cooling water
B. the circulating water
C. the cooler
D. the cooling water space

[单选题]General, the best way for replacement of lamp is （）.

A. after the point is reached at which the failures begin to increase rapidly
B. before the point is reached at which the failures begin to increase rapidly
C. before the point is reached at which the failures begin to increase slowly
D. after the point is reached at which the failures begin to increase slowly

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