正确答案: B
8000
题目:滚动轴承累积工作时间达到其额定使用寿命时即应换新轴承。一般累积工作时间约为()h。
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学习资料的答案和解析:
[单选题]对耗损故障期的错误表述是()。
耗损故障期的故障率是时间t的递减函数
[单选题]During the suction stroke, the piston is moving ().
downwards
[单选题]The sealing rings are in four parts and pressed together around the piston rods by means of ().
coil springs