You always have _______ questions. [ ]
A. too much
B. much too
C. too many
D. many too
答案:C
对软齿面(硬度≤350HBS)齿轮传动,当两齿轮均采用45钢时,一般采用的热处理方式为:小齿轮()大齿轮()
简述降低油品蒸发损耗措施?