""__ใบสมัครเข้าอบรม____สัมมนาพิเศษ__" ความปลอดภัย ในการปฏิบัติงานเกี่ยวกับไฟฟ้าและการช่วยเหลือผู้ประสบอันตราย จากไฟฟ้า"

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