选择稀释剂时应考虑稀释剂对萃取剂的（）等方面的影响。
A.选择性
B.萃取率
C.萃取容量
D.分配比
参考答案：A, B, C
It has been revealed that some govemment leaders______their authority and position to get illegal
profits for themselves. [ ]
A. employ
B. take
C. abuse
D. overlook
什么叫蒸汽出口挡板？结构原理是什么？
