单项选择题
A.初馏分 B.精吹残 C.酸焦油
A.60% B.70% C.80% D.90%
A.70~80℃ B.80~90℃ C.90~95℃ D.95~100℃
A.88.8% B.90% C.95% D.98%
微信扫一扫,加关注免费搜题