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下列关于Do…Loop语句的叙述不正确的是 ( )A．Do…Loop语句采用逻辑表达式来控制循环体执行的次数B．当Do while…Loop或Do until…Loop语句中while或until后的表达式的值为 true或非零时，循环继续C．Do…Loop while语句与Do…Loop until语句都至少执行一次循环体D．Do while…Loop语句与Do until…Loop语句可能不执行循环体
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WhichoftheseLayer2accessdesignsdoesnotsupportVLANextensions?()
A.FlexLinksB.loop-freeUC.loopedsquareD.loopedtriangleE.loop-freeinvertedU
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●The term, (74) loop, refers to a loop that is contained within another loop.(74)A.programB.nestedC.statement,D.Network
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下列关于loop back interface的说法（）是不正确的？A、loop back interface是CISCO路由器上缺省端口B、loop back interface一个永远不会DOWN的逻辑端口C、loop back interface是一个做自环测试的端口D、loop back interface是对端使用LOOPBACK命令测试链路后本端的端口状态
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Loop guard and UniDirectional Link Detection both protect against Layer 2 STP loops. In which two ways does loop guard differ from UDLD in loop detection and prevention？ （）A、 Loop guard can be used with root guard simultaneously on the same port on the same VLAN while UDLD cannotB、 UDLD protects against STP failures caused by cabling problems that create one-way links.C、 Loop guard detects and protects against duplicate packets being received and transmitted on different portsD、 UDLD protects against unidirectional cabling problems on copper and fiber media.E、 Loop guard protects against STP failures caused by problems that result in the loss of BPDUs from a designated switch port.
考题
Loop guard and UniDirectional Link Detection both protect against Layer 2 STP loops. In which two ways does loop guard differ from UDLD in loop detection and prevention？（）A、Loop guard can be used with root guard simultaneously on the same port on the same VLAN while UDLD cannot.B、UDLD protects against STP failures caused by cabling problems that create one-way links.C、Loop guard detects and protects against duplicate packets being received and transmitted on different ports.D、UDLD protects against unidirectional cabling problems on copper and fiber media.E、Loop guard protects against STP failures caused by problems that result in the loss of BPDUs from a designated switch port.
考题
Which statement is true about loop guard？（）A、Loop guard only operates on interfaces that are considered point-to-point by the spanning tree.B、Loop guard only operates on root ports.C、Loop guard only operates on designated ports.D、Loop guard only operates on edge ports.
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气动控制阀的阀门定位器DVC6200的接入控制回路时，正确的接入端子是（）。A、LOOP+，LOOPB、AUX+，AUXC、LOOP+，LOOP-或者AUX+，AUXD、A、B、C、接法均不对
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指令“JBCTI，LOOP”的含义是（）A、TI为1时，程序转至LOOP，同时TI位清零B、TI为0时，程序转至LOOP，同时TI位置1C、TI为1时，程序转至LOOP，TI位不清零D、TI为FFH时，程序转至LOOP，同时TI清为00H
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在Mako模板中，for结构通过loop对象可获取循环的额外信息，以下哪些是loop对象中可获取到的属性（）A、loop.indexB、loop.lenC、loop.oddD、loop.even
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下列关于Do…Loop语句的叙述不正确的是（）。A、Do…Loop语句采用逻辑表达式来控制循环体执行的次数B、当Do While…Loop或Do Until…Loop语句中While或Until后的表达式的值为True或非零时，循环继续C、Do…Loop while语句与Do…Loop until语句都至少执行一次循环体D、Do While…Loop语句与Do Until…Loop语句可能不执行循环体
考题
下列关于do while…loop和do…loop until循环执行循环体次数的描述正确的是（）。A、do while…loop循环和do…loop until循环至少都执行一次B、do while…loop循环和do…loop until循环可能都不执行C、do while…loop循环至少执行一次，do…loop until循环可能不执行D、do while…loop循环可能不执行，do…loop until循环至少执行一次
考题
指令“DJNZR5，LOOP”的含义是（）A、R5中数加1为FFH，则程序转到标号LOOP处执行B、R5中数加1不为零，则程序转到标号LOOP处执行C、R5中数减1不为零，则程序转到标号LOOP处执行D、R5中数减1为零，则程序转到标号LOOP处执行
考题
指令“JNZLOOP”的含义是（）A、A中数为零，则程序转到标号LOOP处执行B、A中数不为零，则程序转到标号LOOP处执行C、B中数为零，则程序转到标号LOOP处执行D、B中数不为零，则程序转到标号LOOP处执行
考题
Which of the following describes the roles of devices in a WAN (Choose three.)（）。A、A CSU/DSU terminates a digital local loop.B、A modem terminates a digital local loop.C、A CSU/DSU terminates an analog local loop.D、A modem terminates an analog local loop.E、A router is commonly considered a DTE device.F、A router is commonly considered a DCE device.
考题
Which of the following describes the roles of devices in a WAN?（）A、A CSU/DSU terminates a digital local loop.B、A modem terminates a digital local loop.C、A CSU/DSU terminates an analog local loop.D、A modem terminates an analog local loop.E、A router is commonly considered a DTE device.F、A router is commonly considered a DCE device.
考题
Which test checks the transmitter and receiver of a local modem？（）A、data parityB、analog loop backC、local digital loop backD、remote digital loop back
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下列关于APU火警探测说法正确的是（）A、LOOP A探测到火警同时LOOP B 失效B、LOOP B探测到火警同时LOOP A 失效C、C、LOOP LOOP B 在5秒之内均失效D、以上答案均正确
考题
多选题Which of the following describes the roles of devices in a WAN? (Choose three.)（）AA CSU/DSU terminates a digital local loop.BA modem terminates a digital local loop.CA CSU/DSU terminates an analog local loop.DA modem terminates an analog local loop.EA router is commonly considered a DTE device.FA router is commonly considered a DCE device.
考题
多选题PL/SQL的循环控制语句LOOP包括以下（）类型。ALOOPBWHILE…LOOPCIF…LOOPDFOR…LOOP
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