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课程 2
Electricity and circuits
📖 课程
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🎯 测验——选择翻译
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✅ 本课已完成
Electricity is a flow of tiny particles — electrons. Current only flows in a closed circuit: battery → wire → bulb → back. Break it — the light goes out.
⚠ Water conducts electricity — no hairdryer near the bath! A socket is not a toy.
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重力
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磁力
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摩擦力
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空气阻力
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重量
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推与拉