直径越大，空气阻力也越大，所以应该速度也应该更小。

来源: chufang 于 2017-12-15 15:50:24 [博客] [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.