To control and manage processes, which of the following data structures should be set up?

A．PCT

B．PCB

C．PCM

D．PCL

[单选题]Which of the processes listed would be the most satisfactory method to use to lower the humidity of the air being circulated by an air conditioning system?A．Cooling the air to a temperature just above dew pointB．Heating the air to a point at which mo

[单选题]Which of the listed pressure control valves would be used to establish the maximum operating pressure of a hydraulic system?A．Pressure-reducing valveB．Unloading valveC．Counterbalance valveD．Pressure-relief valve

[单选题]_______control system is one in which the control action is independent of the output.A．Feed backB．Negative feed backC．Close loopD．Open loop

[单选题]The control mode in which tile final control element is moved from one of two fixed positions to the other is known as______.A．dead band actionB．neutral zone actionC．rangeD．on-off action

[单选题]In the following activities, which one needs most control?A.Retelling.B.Fin

[单选题]In the following activities, which one needs most control?A.Retelling.B.Fin

[单选题]Which of the following can be directly obtained by means of an indicator card?（）A . powerB . maximum pressure in a cylinderC . mean pressure in a cylinderD . all of the above

[单选题]Which of following data is NOT painted on the bow of a lifeboat?（）.A . Number of persons allowedB . Name of the vesselC . Weight of the boatD . Home port

[单选题]The church tower which_________ will be open to tourists soon. The work is almost finished.A． has restoredB． has been restoredC． is restoringD． is being restored

[单选题]A．ccording to the last paragraph, which of the following will be accepted by the author?A． Science is the cause of modem problems.B． Science itself is neither good nor bad.C． Science leads to environmental pollution.D． Science causes many antisocial