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3. สมบัติของแสงมีกี่ประเภท อะไรบาง
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4. พลังงานทดแทนหมายถึงอะไร จงยกตัวอยางการนําพลังงานทดแทนไปใช
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134 วิทยาศาสตร์ ระดับมัธยมศึกษาตอนต้น : พว21001
ส�ำนักงำน กศน.จังหวัดกำฬสินธุ์
