ใบงานที่ ๒ ๘

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-.. / - - 1) 2) 3) 4) 5) .. http://www.thaigoodview.com/library/contest2551/tech04/22/standard/p01.html

http://www.lks.ac.th/anchalee/tec51.htm

1. 2. 3. 4. 5.

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.. http://www.gotoknow.org/posts/314100

.. http://dc338.4shared.com/doc/a4t84gCH/preview.html