受付国值机员直通电话业务
International Operator Direct Connection ( IODC ) Service
模拟电话通话
simulate telephone communication
市内电话电话号码配换选号
Selection or Change of Telephone Number
广告电话直销
direct response advertising
微机控制直通电空制动系统
Micro-computer Controlled Straight Electro-pneumatic Braking System
PHS个人手持电话通信系统
PHS personal handy-phone system