Contact us
Choose a category below so we can get back to you as quickly as possible.
表面積:3.14×8×8+3.14×﹙8/2﹚²×2=301.44平方厘米 體積:3.14×﹙8/2﹚²×8=401.92立方厘米
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.