低压闭合回路系统
low pressure closed loop system
高速数位用户回路系统
HDSL High Data Rate Digital Subscriber Line
高压封闭回路系统
high pressure closed loop system
焊车调速回路
welding tractor governing speed loop
节流调速回路
throttle velocity control circuit
throttle velocity modulating circuits
节流阀式旁路节流调速回路
throttle valve type by-pass trimming circuit