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The mode of control employed by an alarm circuit is a
A.two position control
B.single speed floating control
C.proportional speed floating control
D.reset control
参考答案
更多 “ The mode of control employed by an alarm circuit is aA.two position controlB.single speed floating controlC.proportional speed floating controlD.reset control ” 相关考题
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GPRS／EDGE网络有3种运作模式:MODEⅠ、MODEⅡ和MODEⅢ。以下说法正确的是()
A.MODEⅠ可以选择是否配置MPDCH，MODEⅡ不能配置MPDCH，MODEⅢ一定要配置MPDCH；B.MODEⅠ必须配置MPDCH；MODEⅡ可以选择是否配置MPDCH，MODEⅢ不能配置MPDCH；C.MODEⅠ不能配置MPDCH；MODEⅡ必须配置MPDCH；MODEⅢ可以选择是否配置MPDCH；D.无论何种MODE，均可以不配置FPDCH；
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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 byA.the lack of a feedbackB.the presence of a feed backC.the lack of a computerD.the presence of a computer
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Whichofthefollowingcommandswillsettheduplexofanetworkadapter?()
A.no-amedia_speed=100_Full_Duplexen0B.ifconfig-amedia_speed=100_Full_Duplexent0C.chdev-lent0-amedia_speed=100_Full_DuplexD.chinet-len0-amedia_speed=100_Full_Duplexen0
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完善下面程序下划线的地方，实现排序： def insert_sort（lists): for i in range（len（lists)): position=i while position＞0: lists[position],lists[position-1]=lists[position-1],lists[position] position-=1 print（lists) return lists
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在12MHz的8x51系统里，哪一种方式一次可以定时5ms？ （)。A．Mode 3 及 Mode 2B．Mode 1 及 Mode 2C．Mode 0 及 Mode 1D．Mode 1 及 Mode 3
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