ไฟฟ้า, ฉนวน, สายไฟ, สีน้ำเงิน, โลหะ, เหล็ก, แหล่งจ่ายไฟ, อุปกรณ์, อันตราย, ใกล้ชิด, อุตสาหกรรม
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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