The main component in 4 # solvent is liquefied butane.四 号 溶剂主要成分为液化丁烷.Butane and butylenes has the same characteristic with propane and propylene.丁烯与丁烷表现出与丙烯、丙烷相似的特性.The butane conversion of catalyst aged in different pH...
There was spasmodic fighting in the area yesterday.昨天，那一地区发生过零星的战斗。He managed to stifle the spasmodic sobs of panic rising in his throat.他惊慌得差一点哭了起来，不过还是竭力地克制住了。He appeared to be in a spasmodic sort of hurry.他那副样子好象非常匆促似...