FR

= Facility Request,设备请求;

= Failure Rate, 故障[失效]率;

= Failure Record, 故障[失效]记录;

= Failure Report, 故障[失效]报告;

= Fast Release (Relay), 快速释放(继电器);

= File Register, 文件寄存器;

= Floating-point Register, 浮点寄存器