请附上简要说明,137.液化石油气的主要成份是 .A.甲烷 B.已烷 C.丙烷 D.丁烷138.以下对PH=6.7水溶液的酸性判断准确无误的是 .A.酸性 B.中性 C.碱性 D.不确定139.光纤材料的化学组成是 .A.S
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![请附上简要说明,137.液化石油气的主要成份是 .A.甲烷 B.已烷 C.丙烷 D.丁烷138.以下对PH=6.7水溶液的酸性判断准确无误的是 .A.酸性 B.中性 C.碱性 D.不确定139.光纤材料的化学组成是 .A.S](/uploads/image/z/865948-4-8.jpg?t=%E8%AF%B7%E9%99%84%E4%B8%8A%E7%AE%80%E8%A6%81%E8%AF%B4%E6%98%8E%2C137%EF%BC%8E%E6%B6%B2%E5%8C%96%E7%9F%B3%E6%B2%B9%E6%B0%94%E7%9A%84%E4%B8%BB%E8%A6%81%E6%88%90%E4%BB%BD%E6%98%AF+.A%EF%BC%8E%E7%94%B2%E7%83%B7+B.%E5%B7%B2%E7%83%B7+C.%E4%B8%99%E7%83%B7+D.%E4%B8%81%E7%83%B7138%EF%BC%8E%E4%BB%A5%E4%B8%8B%E5%AF%B9PH%EF%BC%9D6.7%E6%B0%B4%E6%BA%B6%E6%B6%B2%E7%9A%84%E9%85%B8%E6%80%A7%E5%88%A4%E6%96%AD%E5%87%86%E7%A1%AE%E6%97%A0%E8%AF%AF%E7%9A%84%E6%98%AF+.A%EF%BC%8E%E9%85%B8%E6%80%A7+B.%E4%B8%AD%E6%80%A7+C.%E7%A2%B1%E6%80%A7+D.%E4%B8%8D%E7%A1%AE%E5%AE%9A139%EF%BC%8E%E5%85%89%E7%BA%A4%E6%9D%90%E6%96%99%E7%9A%84%E5%8C%96%E5%AD%A6%E7%BB%84%E6%88%90%E6%98%AF+.A%EF%BC%8ES)
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