สิ ่ ง ที ่ อ ยู ่ ใ นกล่ อ ง
สิ ่ ง ที ่ อ ยู ่ ใ นกล่ อ ง
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ตั ้ ง ค่ า ล� า โพง
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1:
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ส่ ว นควบคุ ม ของล� า โพง
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เปิ ด
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ไม่ ไ ด้ ใ ห้ ไ ว้
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. ............................................................................................................ 29
สารบั ญ
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9
T H A