"雄"集是“英”集的子集。“英”是“雄”的必要条件，但不是充分条件！嘻嘻

来源: 无名-1963 于 2025-12-09 10:31:37 [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.