But it's also a matter of accuracy and closingspeed.
精度和接近速度也很重要。
2
Speed control Valves are available for controlling valve opening or closingspeed with pneumatic actuators.
速度控制阀可以用来控制阀门气动执行器的开启或关闭速度。
3
The higher the closingspeed of two aircraft heading towards each other, the bigger the PAZ required, because the pilot needs more time to react to a warning.