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【单选题】

A(n) （） is a device which adds to the energy of a liquid or gas causing an increase in its pressure and a movement of the fluid.

A、pump

B、engine

C、turbine

D、boiler

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第1题
[] Which statement is true regarding proxy ARP？（）

A、A.Proxy ARP is enabled by default on stand-alone JUNOS security devices.  B、B.Proxy ARP is enabled by default on chassis clusters.  C、C.JUNOS security devices can forward ARP requests to a remote device when proxy ARP is enabled.  D、D.JUNOS security devices can reply to ARP requests intended for a remote device when proxy ARP is enabled  

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第2题
[单选题] Which statement is true regarding an Ethernet collision domain?（）

A、If a router is used, the collision domain includes all devices connected to the router  B、If a hub is used, the colision domain is limited to each device and the hub  C、If a switch is used, the collision domain is limited to each device and the switch  D、If a bridge is used, the collision domain includes all devices connected to the bridge  

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第3题
[单选题] Which statement is true regarding an Ethernet collision domain?（）

A、If a router is used, the collision domain includes all devices connected to the router.  B、If a hub is used, the collision domain is limited to each device and the hub.  C、If a switch is used, the collision domain is limited to each device and the switch.  D、If a bridge is used, the collision domain includes all devices connected to the bridge.  

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第4题
[单选题] Which statement is true regarding an Ethernet collision domain?（）

A、If a router is used, the collision domain includes all devices connected to the router.  B、If a hub is used, the collision domain is limited to each device and the hub.  C、If a switch is used, the collision domain is limited to each device and the switch.  D、If a bridge is used, the collision domain includes all devices connected to the bridge.  

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第5题
[] A technician plugs a USB device into the computer. The system tray displays a message that reports the device is installed, but may not work properly. Which of the following is the MOST likely cause of the message?（）

A、A. The device needs a firmware update  B、B. The device needs an updated driver installed  C、C. The plugged in device is too slow for the USB port speed  D、D. The device is incompatible with the installed version of Windows  

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第6题
[多选题] Which two statements are true regarding an Ethernet collision domain?（）

A、If a switch is used, the collision domain is limited to each device and the switch  B、If a hub is used, the collision domain is limited to each device and the hub  C、If a hub is used, the collision domain includes all devices connected to the hub  D、If a switch is used, the collision domain includes all devices connected to the switch  

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第7题
[多选题] Which two statements are true regarding an Ethernet collision domain?（）

A、If a switch is used, the collision domain includes all devices connected to the switch.  B、If a hub is used, the collision domain includes all devices connected to the hub.  C、If a hub is used, the collision domain is limited to each device and the hub.  D、If a switch is used, the collision domain is limited to each device and the switch.  

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第8题
[多选题] Which two statements are true regarding an Ethernet collision domain?（）

A、If a switch is used, the collision domain is limited to each device and the switch.  B、If a hub is used, the collision domain is limited to each device and the hub.  C、If a hub is used, the collision domain includes all devices connected to the hub.  D、If a switch is used, the collision domain includes all devices connected to the switch.  

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第9题
[多选题] Which two statements are true regarding an Ethernet collision domain?（）

A、If a switch is used, the collision domain is limited to each device and the switch.  B、If a hub is used, the collision domain is limited to each device and the hub.  C、If a hub is used, the collision domain includes all devices connected to the hub.  D、If a switch is used, the collision domain includes all devices connected to the switch.  

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第10题
[单选题] A carburetor is required to have a safety device called a(n)（）.

A、pressure release  B、backfire flame arrestor  C、automatic shut off  D、flow valve  

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