active trabecular calcification surface活动性小梁钙化面 Patient Evaluation & Conferencing System (Rehabilitation Foundation, Inc.)病人的评估及会议系统(康复的基础上,公司。) Advanced Train Control System先进的列车控制系统 Air Traffic Control System航空交通管制系统 Senior Chief Aviation Electronics Technican (USN rating)高级长官航空电子Technican(舰钩挂等级) Advanced Technology Crew Station先进的技术人员 Advanced Tactical Communications System先进的战术通讯系统 Ascent Training & Consultancy Services (Hyderabad, India)提升培训及咨询服务(海德拉巴,印度) Air Traffic Control Specialist空中交通管制的专家 Air Traffic Communications Station空中交通通讯电台 Antique Telephone Collectors Association古董电话收藏家协会 Audit Tracking and Control System (environment)审计跟踪和控制系统(环境) Aircraft/Airborne Tactical Control System飞机机载战术的控制系统 air traffic control section (US DoD)空中交通控制部分(美国国防部) Automated Test and Calibration System自动检测和校准系统