หูฟัง, ไมโครโฟน, เครื่องหมายคำถาม, ชุดหูฟัง, ศูนย์รับแจ้ง, บริการ, คำถาม, คำตอบ, ข้อมูล, การให้คำปรึกษา, สนับสนุน
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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