manganese carbonate短语¹¹⁴⁴⁶⁷⁺⁴ 基本例句 碳酸锰 The manganese/span> carbonate can be used to produce medium- manganese welding flux only by lowering the content of magnesium oxide in manganese carbonate and making new component design. 结果表明，只要克服碳酸锰矿中含氧化镁高的不利因素，进行新的组份设计，可以用来生产新的中锰型焊剂。 cnki