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(中文) 2-4電路出故障了
(中文) 2-5里面是怎樣連接的
(中文) 2-6導(dǎo)體和絕緣體
(中文) 2-7電路中的開(kāi)關(guān)
(中文) 2-8模擬安裝照明電路
(中文) 3-1巖石與土壤的故事
(中文) 3-2認(rèn)識(shí)幾種常見(jiàn)的巖石
3-3巖石的組成
3-4制作巖石和礦物標(biāo)本
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