ppm是什么意思_ppm的用法_翻译_读音

- abbr. 每分钟页数(=pages per minute)
- abbr. 百万分之 ... (=parts per million)
详尽释义
abbr. 缩略词

=parts per million 百万分之...

=pulse position modulation 脉波位置调变

=pages per minute 每分钟页数
临近单词

PPP PP PPMS PPMgLN ppm. ppmm n. PPMs of fisheries PPM in Wireless Infrared Communication