那个仪器就是一滴水和一碗水的区别

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material particles less than 100 um are considered nano. -Maddie'sMom- 给 Maddie'sMom 发送悄悄话 Maddie'sMom 的博客首页 (209 bytes) () 09/08/2012 postreply 08:34:46

typo: < 100 nm is nano -Maddie'sMom- 给 Maddie'sMom 发送悄悄话 Maddie'sMom 的博客首页 (0 bytes) () 09/08/2012 postreply 08:36:00

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