Contact us
Choose a category below so we can get back to you as quickly as possible.
連接DH和DG 連接BD與AC交與O 在△ABH中 EG‖BH 在△CBG中 BG‖FH 四邊形GBFD是平行四邊形 OG=OH OB=OD AG=CH OA=OC ABCD為平行四邊形
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.