正确答案: B
B.15%
题目: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。
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学习资料的答案和解析:
[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
Ⅰ,Ⅱ都对
[单选题]The space between cylinder liner and jacket is called ().
the cooling water space
[单选题]General, the best way for replacement of lamp is ().
before the point is reached at which the failures begin to increase rapidly