齿轮传动的润滑油如何选择?
参考答案:
对于闭式齿轮传动,可按轮齿材料和圆周速度选择。当载荷大、速度低、工作温度低时,选粘度大的润滑油;反之则选粘度小的润滑油。
—Were you seeing a film at 2: 00 yesterday afternoon?
— _______. And it was very wonderful. [ ]
A. No, I wasn't
B. Yes, I was
C. That's right
D. You were wrong.
抑制结核杆菌蛋白合成的药物是()
A.异烟肼
B.利褔平
C.链霉素
D.乙胺丁醇
E.氨基水杨酸