1、
2、
Selenium is one of the most important metalloid element existing in biotic environment.
硒是生物环境中存在的一种重要的类金属元素.
网络文摘精选
3、
Metalloid mine product already became our country's important exit to achieve collect goods.
非金属矿产品已成为我国重要的出口创汇商品.
网络文摘精选
4、
5、
