A.細(xì)實(shí) B.粗實(shí) C.細(xì)虛 D.粗虛
A.氫氣/乙烯比值越高樹脂指數(shù)越低 B.氫氣/乙烯比值越低樹脂指數(shù)越低 C.氫氣/乙烯比值越高樹脂指數(shù)越高