由F作BC垂线，总面积20，5是20一半的一半，可判断

来源: 站住于 2021-08-05 09:59:41 [旧帖] [给我悄悄话] 本文已被阅读：次

WENXUECITY.COM does not represent or guarantee the truthfulness, accuracy, or reliability of any of communications posted by other users.

Change Ad Consent