发布时间:2025-01-19 16:29:41
石英石化学成分是二氧化硅(SiO2)半透明或不透明的晶体,含有杂质时颜色不一。方解石是一种碳酸钙矿物(CaCO3),敲击方解石可以得到很多方形碎块,故名方解石。
和两个朋友合伙开了个宾馆干了有整一年了其中有一个朋友要退股需要退给他多少钱呢
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