A.10-6 B.10-8 C.10-10 D.10-12
A.超聲波清洗 B.機(jī)械刷洗 C.溶液噴射清洗 D.以上三項(xiàng)
A.指數(shù)B.數(shù)值C.正對(duì)數(shù)D.負(fù)對(duì)數(shù)