เครื่องวัดเส้นผ่าศูนย์กลาง, ดินสอ, ยางลบ, โรงเรียน, เขียน, ปากกา, การวาดภาพ, กระดาษ, พัสดุ, ทางเรขาคณิต
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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