Contact us
Choose a category below so we can get back to you as quickly as possible.
選A、C 截平面和圓錐的軸線相交,截交線的形狀為圓(截平面與軸線垂直)或橢圓(截平面與軸線不垂直).
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.