若螺纹的升角 y 等于螺纹副的当量摩擦角 r v = 8.8 ° ,则拧紧螺母时的效率为 ______ 。
A.
0.5
B.
0.488
C.
0.312
D.
1
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
微信内点击右上角“…”即可分享
反馈
参考答案:
举一反三
【简答题】For many people in the U.S., sports are not just for fun. They are almost a religion. Thousands of sports fans buy expensive tickets to watch their favourite teams and athletes play in ___1___. Other ...