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【单选题】【消耗次数：1】
键线式可以简明扼要的表示碳氢化合物，<img src="20200609/1591666012374822.png" title="1591666012374822.png" alt="图片TTTTTTTTTT.png"/>种键线式物质是（ ）。
① 丁烷
② 丙烷
③ 丁烯
④ 丙烯
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