Fair and (73) competition in government procurement around the world is good business and good public policy．Competitive pricing，product (74) and performance improvements result from competitive practices and help ensure that government authorities get the best (75) for the public they serve．

A．open
B．continue
C．dependent
D．reliable

制备乳剂时必须加入（）

A.弱酸

B.润滑剂

C.表面活性剂

D.助悬剂

E.湿润剂