氨的合成主要经过四道工序.There are four major steps in ammonia synthesis.试计算氮在尿素及硫酸氨的质量百分率.Calculate the percentage by mass of nitrogen in urea and ammonium sulphate.这种肥料经过化验表明氨的含量很高.Tests of the manure showed a high ammonia content...
水 ( 从贮水池 ) 缓缓流出.The water slowly emptied ( from the cistern ).它使萨克拉门托三个不同地点的贮水池中的水发生准共振.This caused quasi - resonance to the liquids in tanks at three different locations in Sacramento.我们有多少个贮水池?How many storage reservoi...