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内容来自iPhone手机客户端
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内容来自Android手机客户端
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yqn12:c多少是混凝土的标号,不是水泥的标号。水泥,沙,石的不同配比是决定混凝土标号的关键。你去路边买水泥都是一样的,只是牌品不同。 (2016-05-24 10:03)
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