海洋微生物腐烂后沉积形成磷酸盐。The phosphate was deposited by the decay of marine microorganisms.流入湖中的泉水和河水携带了溶于水的硝酸盐和磷酸盐。Springs and rivers that drain into lakes carry dissolved nitrates and phosphates.我们使磷酸盐岩同硫酸发生化学反应制造过磷酸钙.We make s...
No one would dream of straightening out the knobbly spire at Empingham Church.谁都无法将埃姆平汉教堂疙瘩嶙峋的尖顶弄直。Straightening vanes can be used where long straight ways are not possible.在不可能安装较长的直管段情况下,可以来用导流叶片.Straightening vanes ar...