Contact us
Choose a category below so we can get back to you as quickly as possible.
(1)R/5*1/3=R/15≥1 R≥15 R的最小值為15 (2)6/7*S/0.6=10/7 S≥1 R≥7/10 S的最小值為7/10
We and our partners use cookies and other technologies to analyze traffic and optimize your experience. View more info and control your cookies settings at any time in our Cookies Policy.