差分键控 differencial global positioning system: 差分全球定位系统keying: 按电键; 按键; 键控发报; 抠像; 锁结 锁上 键控; 楔紧; 楔连接; 楔住; 用键固定; 粘固keying in: 键控输入; 用石楔咬紧keying-on: 键控继续absorber keying: 吸收发报法下载手机词典可随时随地查词查翻译