Contact us
Choose a category below so we can get back to you as quickly as possible.
F1S1=F2S2∴F1F2=S1S2=94∴L1L2=32∴V1V2=278,F1F2=m1m2=94∴ρ1ρ2=m1V1m2V2=92748=23.故選A.
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.