泵轴密封泄漏的原因有哪些?
参考答案:
①填料密封损坏,或轴套磨损,填料函压得过紧。②填料材料选择不当,填料或水封环安装得不合适。③机械密封安装不合格或机械密封损坏。
Please tell me ______. I have some good news for him. [ ]
A. where Robert lives
B. where does Robert live
C. where Robert lived
D. where did Robert live
油绳、油垫润滑主要用在低速轻负荷的轴套上。