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อะไรคือหลอดไฟ C9
หลอด C9 เป็นประเภทของหลอดไฟ โดยเฉพาะในช่วงเทศกาลคริสต์มาส ซึ่งมีลักษณะเด่นคือมีขนาดใหญ่กว่าหลอดไฟคริสต์มาสประเภทอื่น เช่น หลอด C6 และ C7
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คำถามที่พบบ่อย
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อัตราการใช้ห้อง (Room Utilization Factor) คืออะไร
Room utilization factor is the percentage of actual light that reaches the surface of a room.
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