| 释义 |
ppmabbr.① parts per million百萬分之一(微少含量的單位)ppm/ˌpiːpiːˈem/n.1.=parts per million2.=peak programme meter详细释义源自:《新世纪英汉大词典》Collins外研社 n /ˌpiːpiːˈem/=parts per million=peak programme meterppm一百万分之一ppm百万分之一双向☞PPM--pulse position modulation双向☞ppm-- part(s) per mi |