如何判断石灰窑稳定正常运行？
编码中所使用的标识性的代表符号即（）。 ["商品代码","商品条码","商品分类","商品目录"]
干馏煤气的低热值约为（）。 ["5.4MJ\/Nm3<\/sup>","10MJ\/Nm3<\/sup>","17kJ\/Nm3<\/sup>","46kJ\/Nm3<\/sup>"]
The set of the ocean current is caused by（）. ["density differences of the water","rotation of the earth","direction of primary circulation of air","all of the above"]
点窑应注意哪些问题？
如何除去二氧化碳中的尘粒？
