略語大辞典 [Chem] 25 PB propane-propylene, butane-butylene (fraction) (石油の)プロパン-プロピレン, ブタン-ブチレン留分.propane-propylene, butane-butylene (fraction); of an oil; [Chem:E]. 丸善「略語大辞典」JLogosID : 11854879