(2013)下列矿物中仅含有碳元素的是:()
A.石膏
B.石炭
C.石墨
D.石英
参考答案:C
解析:石膏的主要成分为硫酸钙,石灰的成分为氧化钙,石墨的成分为碳,石英的成分为氧化硅。
设置高压氮气压缩机的作用是()。
A、向循环气系统补充氮气
B、在开车时向反应器进行冲压
C、在开停车时对氧气混合站进行吹扫
D、在开停车时对装置进行吹扫
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