单词	part(s)per million
释义	同part(s)per million-- ppm
随便看	high density bipolar high density bipolar code high density bipolarcode high-density bipolar coding high density bipolar{=hdb} code high density buffer high density capacitor high-density cargo high density center high density data high density data system high density data transmitter high density data transmitter--hddt high density data transmitter，hddt high density digital recording high density digital tape high density digital tape{=hddt} high density digital tape recorder high density digital tape recorder--hddtr high density digital tape recorder，hddtr high-density disk high density diskette high-density diskette high density dram high-density dram