Sequential circuit is a common logic device whose output values, at a given instant, depend upon its input values and the internal state at that instant, and whose internal state depends upon the(66)preceding input values and the preceding internal state. A sequential circuit can assume a finite number of internal states and may therefore be regarded, from an abstract(67), as a finite(68).Combinational circuit is another logic device whose output values, at any given instant, depend upon the input values at that instant. A combinational circuit is a(69)of a sequential circuit whose internal state is not taken(70).

A．directly

B．immediately

C．instantly

D．snapshot

exceptions    in order    message  punctualhave something in common     

[名词解释] 序变模式（sequential model）

[单选题]对于命令mdadm-A、/dev/md0/dev/sdd1/dev/sdc1，描述正确的是（）A .添加sdd1和sdc1到md0中B .将sdd1和sdc1自阵列md0中移除C .激活了含有sdc1和sdd1的陈列设备md0D .以上说法均错

[试题]C．ircuit Switching is problematic because data communications is（），that is， it is typically dominated by short bursts of activity with long periods of（）.A．reliable B．bursty C．digital D．continuous A．latency B．transmission C．delay D．inactivity

[单选题]A heater in the circuit facilitates warning of the engine prior to （） by circulating hot water.A . startingB . stoppingC . to startD . to sto

[名词解释] SELV回路（SELV circuit）

[名词解释] PELV回路（PELV circuit）

[单选题]自差Dev等于（）。A .GC＋ΔG－CC＋DevB .GC＋ΔG＋MCC .GC＋ΔG－MCD .MC－CC

[单选题]Circuit-switching technology is used in Publish Switched Telephone Network(PSTN), Global System for Mobile Communications(GSM) and code Division Multiple Access (CMDA) . It is a ( ) information transfer mode.A . connection orientedB . connectionles

[名词解释] VC（Virtual Circuit）虚电路