结合化学知识�们可以对生活中的很多现象有更深的了解.下述认识正确的是a可以用ph试纸区别硬水和软水b加油站内不得使用手机是因为信号不好c Template




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tomski结合化学知识�们可以对生活中的很多现象有更深的了解.下述认识正确的是a可以用ph试纸区别硬水和软水b加油站内不得使用手机是因为信号不好c coloring