The process technologies,selection of equipment and its corrosion in the production of potassium sulphate from potassium chloride and ammonium sulphate are discussed. 提出以硫酸銨和氯化鉀為原料，複分解製取農用硫酸鉀的工藝條件及工藝流程，並探討生產中設備選擇及腐蝕問題。
Presents the general ventilation and air conditioning schemes for removing indoor excessive heat in a substation, and summarizes the calculation methods of equipment selection. 摘要介紹了變配電機房消除室內餘熱常用的通風空調方案，並總結了設備選擇的設計計算方法。
