A.1.0mm,0.1mm,0.01mm,0.001mm B.2.0mm,0.2mm,0.02mm,0.002mm C.1.0cm,0.1cm,0.01cm,0.001cm
A.2.6MHz B.1.3MHz C.6MHz D.4.3MHz
A.機(jī)械方法和液相清洗法 B.機(jī)械方法和汽相清洗法 C.液相清洗法和汽相清洗法 D.機(jī)械方法和化學(xué)方法