ประกาศนียบัตร, ประกาศนียบัตรชั้นสูง, ขาวกับดำ, เข็มขัดนิรภัย, แถบ, แบบ, ขนาน
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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