ชุดทดลองวงจรไฟฟ้าสำหรับเด็ก 4 ชุด พร้อมขั้วหลอดไฟขนาดเล็ก กล่องแบตเตอรี่ สวิตช์ แผงวงจรขนาดเล็กแบบพกพา สำหรับห้องเรียน

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