九年級英語上冊unit5lookintosciencelesson26keepthecandleburning教學(xué)課件新版冀教版(編輯修改稿)
2024-07-11 12:07 本頁面
【文章內(nèi)容簡介】 of the jar rests on the dish. As the candle burns, it the oxygen in the air. When the candle stops , it has used up all the oxygen in the air. The water inside the jar and fills about of the jar. This is because about one fifth of the air is made up of oxygen. match Let burning risesWhat is happening? 1) 分?jǐn)?shù)由分子和分母兩部分構(gòu)成。用英語表達(dá)時，分子用基數(shù)詞，分母用序數(shù)詞 。 2) 如果分子為 1，則分母的序數(shù)詞是單數(shù)形式，如果分子大于 1，則分母的序數(shù)詞用復(fù)數(shù)形式。 3)
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