除少数含杂质少的原油所得蒸馏产品可直接作为成品油或调合组分外,大多数原油生产的直馏产品都含有硫、氮、氧等杂质,需要进行()处理。
A、精制
B、蒸馏
C、聚合
D、异构化
参考答案:A
— Can you lend me the book Gone with the Wind?
— Sorry. I returned it to the library just now. Maybe it is still ____.
A.available
B.affordable
C.acceptable
D.valuable
库欣病的病因是()
A.垂体ACTH腺瘤
B.肾上腺皮质腺瘤分泌大量皮质醇
C.下丘脑-垂体功能紊乱
D.非内分泌腺肿瘤组织分泌ACTH
E.Meador综合征