精制操作中塔压的上升会使()。
A、气相中轻组分浓度增加
B、液相中轻组分含量增加
C、气相总量增加
D、液相总量减少
参考答案:A, B
The damaged building , so the people will have to look for other places to shelter themselves from the cold.
A.is being repaired
B.is repaired
C.has been repaired
D.was repaired
实验室应保存人员的()和技能等的档案。
A.经历
B.学历
C.资格
D.培训