·2,447,543篇论文数据，部分数据来源于NoteExpress
球文石是碳酸钙的同质多象变体，最不稳定，很少在自然界出现。
By optical microscope, vaterite , a very unstable polymorphism of calcium carbonate, which rarely appears in nature, has been discovered.
youdao
应用推荐
模块上移
模块下移
不移动