In ______ the control action is independent on the output.A.a closed loop control systemB.

What does the Western societies not value?

A、Individualism, independent thinking, and initiative.

B、Discipline and self-control.

C、Cooperation.

D、Vicious competition.

200 Start the turning gear， and with some one hand-operating the cylinder lubricators at regular intervals, and with the indicator cocks@,

and with the control gear in theoposition, give the engine at least one complete turn

A.open; stop

B.closed, stop

C.open; start

D.closed: start

According to the passage, the most ambitious effort to control pollution ______.

［A］could help improve the local economy

［B］will be financially supported by the truckers

［C］may depend on independent contractors

［D］will upgrade all the trucks to reduce pollution

第一组

An automatic system usually consists of a control system and an information system. A control system is a system which measures the condition of some entity and, with the information, governs the state of a variable; i.e., speed, temperature, pressure, position, etc. The open-loop system is the simplest form. a control system may assume. It is distinguished from the closed-loop system by the lack of an input which measures the state of the controlled variable; such an input is called a feedback. In modern ships the open-loop system has practically disappeared and the closed-loop system which operates with a feed-back is extensively used. An information system serves the parallel function of monitoring system or plant performance. The monitoring function may serve a number of purposes; specifically it may indicate values of controlled variables to guide remote control operations, warn of off-limit conditions and provide record of performance. In many cases a visual and audible alarm may be provided to warn of off-limit conditions on board ship and, associated with this, the important variables will be recorded on demand. The automatic control system can be more sophisticated by incorporating digital-processing equipment, that is, a computer. This computer is usually fed with signals from all sensors. It scans the values of the sensors and generates alarm signals for off-limit conditions, acting as a super-supervisor. Sometimes, it can even make necessary and take the necessary action to optimize performance without human intervention.

The closed-loop system differs from the open-loop system by

A.the lack of a feedback

B.the presence of a feed back

C.the lack of a computer

D.the presence of a computer

A. typical

B. bare

C. close

D. rapid

_______control system is one in which the control action is independent of the output.

A.Feed back

B.Negative feed back

C.Close loop

D.Open loop

Flash中怎样允许帧actions生效?

A. 选择 Control >Loop Playback

B. 选择 Control >Play All Scenes

C. 选择 Control >Mute Sounds

D. 选择 Control >Enable Frame. Actions

One important difference is that an ActiveX control must be(74) for a specific platform, while an applet is platform-independent.

A．transactioned

B．compiled

C．created

D．identitied