送交者: bluesea 于 2012-01-05, 12:26:00:

回答: 短江的好贴：曹冲，秦人，浮力定律。 由 短江学者 于 2012-01-05, 11:35:06:

• You can't be sure the two boats are same. (无内容) - jxh (0 bytes) 2012-01-05, 20:47:50 (640336)

加跟贴