1) ข้อใดคือวัสดุตีพิมพ์ a) b) c) d) 2) ข้อใดคือวัสดุไม่ตีพิมพ์ a) b) c) d) 3) ข้อใดคือวัสดุย่อส่วน a) b) c) d) 4) ข้อใดคือกฤตภาค a) b) c) d)

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