在保证装置当量环氧乙烷产量相同的情况下,随着催化剂使用时间的延长()的加入量会上升。
A、乙烯
B、氧气
C、甲烷
D、氮气
参考答案:A, B
As far as I know, shopping online has many advantages, ________the most important one is convenience.[ ]
A. during which
B. of them
C. of which
D. of whom
成人牙齿过早松动脱落的主要原因是
A.肾阳虚衰
B.肾阴亏虚
C.肾气不固
D.肾精不足
E.肾不纳气