进料组分丙烷含量异常增多,则以下哪些调整方法是正确的()
A、联系上游装置调整操作
B、增加不凝气排放
C、气体分馏装置适当降处理量
D、提高丙烯回流量
参考答案:A, C, D
In order to improve English _____.
A.Jenny’s father bought her a lot of tapes
B.Jenny bought a lot of tapes for herself
C.a lot of tapes were bought by Jenny
D.a lot of tapes were bought by Jenny’s father
礼仪的起源可以追溯到()。
A.清代
B.远古代
C.宋代
D.古代