ป้ายถนน, ทางขวา, ทดสอบ, การทดสอบความถนัด, การทดสอบ, การทดลอง, ควบคุม, ตัวอย่าง, ตรวจสอบ, พยายาม, การสอบ
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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