常見(jiàn)例句According to the characteristics of pinnoite in Dachaidan, a new technology of preparing boric acid with two-step sulfuric acid method was studied.摘要針對(duì)大柴旦柱硼鎂石礦特點(diǎn)，對(duì)酸法制硼酸進(jìn)行了工藝優(yōu)化研究。 返回 pinnoite