下列处理剂中那种具有稀释作用()。
A.PF-FLO
B.DRISPAC
C.PF-PLUS
D.FCLS
参考答案:D
The question is very _____. I can't find the answer. [ ]
A. relaxing
B. interesting
C. difficult
D. exciting
检验检疫机构把生产企业分为三类,对于二类企业采取抽查检验,则批次抽检率可以为( )。
A.15%
B.30%
C.45%
D.100%