Expert control is an important branch of intelligent control, also known as expert intelligent control.

There was nothing they could do about it. The situation was out of control. A: in control B: in the control C: out control D: out of control

which variable will be measured in the feedback control?______ will be measured in the feedback control.

The implementation of multiple exchange rate system belongs to the type of （ ）in exchange control. A: quantity control B: price control C: direct control D: indirect control

Hydraulic systems can provide hydraulic power for elevators so that to reduce the control force of the pilot for pitch control.

Which of the following descriptions is wrong about the control of an air conditioner?_____ A: The control position can be divided into remote control and local control. B: In local control, the automatic control system also needs to work. C: If the remote control doesn't work, the air conditioner won't work. D: In case of control system failure, manual control mode can be adopted.

Question 1: ( ) A: President Obama criticized the Congress for not passing the law of<br/>gun control. B: President Obama advocated the Congress to pass the law of gun<br/>control. C: President Obama believed the gun control debate needed to change. D: President Obama disagreed with the gun control act carried out by the<br/>Congress.

According to the American Association of Cost Engineers, cost engineering is defined as that area of engineering practice where engineering judgment and experience are utilized in the application of scientific principles and techniques to the problem of ( ) A: Cost estimation, cost control and profitability. B: Statstical inference, cost estimation and cost control. C: Allocation of joint costs, cost control and profitability. D: Cost estimation, cost control and statstical inference.

In many airplanes, the elevator is controlled by two cables: a “down” cable and an “up” cable. Normally, a break or disconnect in only one of these cables will not result in a total loss of elevator control. In most airplanes, a failed cable results in a partial loss of pitch control. In the failure of the “up” elevator cable the control yoke will move aft easily but produce no response. Forward yoke movement, however, beyond the neutral position produces a nose down attitude. Conversely, a failure of the “down” elevator cable, forward movement of the control yoke produces no effect. The pilot will, however, have partial control of pitch attitude with aft movement. When experiencing a loss of up-elevator control, the pilot can retain pitch control by: • Applying considerable nose-up trim. • Pushing the control yoke forward to attain and maintain desired attitude. • Increasing forward pressure to lower the nose and relaxing forward pressure to raise the nose. • Releasing forward pressure to flare for landing. When experiencing a loss of down-elevator control, the pilot can retain pitch control by: • Applying considerable nosedown trim. • Pulling the control yoke aft to attain and maintain attitude. • Releasing back pressure to lower the nose and increasing back pressure to raise the nose. • Increasing back pressure to flare for landing. Trim mechanisms can be useful in the event of an in-flight primary control failure. For example, if the linkage between the cockpit and the elevator fails in flight, leaving the elevator free to weathervane in the wind, the trim tab can be used to raise or lower the elevator, within limits. The trim tabs are not as effective as normal linkage control in conditions such as low airspeed, but they do have some positive effect — usually enough to bring about a safe landing. If an elevator becomes jammed, resulting in a total loss of elevator control movement, various combinations of power and flap extension offer a limited amount of pitch control. A successful landing under these conditions, however, is problematical.

( ) is the basis of internal control.