单项选择题
A.compressed air and nitrogen B.helium and nitrogen C.oxygen and hydrogen D.oxygen and acetylene
Restrictions occurring in the small orifices of pneumat...
单项选择题Restrictions occurring in the small orifices of pneumatic control system components can be used by （）
A.moisture in the compressed air supply B.excessive dryness in the compressed air supply C.pressure surging in the compressed air receiver D.insufficient lubrication of the system components
In a pneumatic automation system, a unit producing a si...
单项选择题In a pneumatic automation system, a unit producing a signal to govern the position of the controller of the measured variable, relative to the value of the measured variable, is said to have（）.
A.reset action B.proportional action C.two position action D.rate action
In an automation system, the effect of a control action...
单项选择题In an automation system, the effect of a control action sensed by a controller is known as （）
A.command input B.set point signal C.output D.feedback
