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Which of the following commands can be issued without interfering with the operation of loop guard？（）
A . Switch（config-if）#spanning-tree guard root
B . Switch（config-if）#spanning-tree portfast
C . Switch（config-if）#switchport mode trunk
D . Switch（config-if）#switchport mode acce
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A high temperature alarm or （） which will melt is used to guard against the explosion of compressor air pipelines.
A . a flame trap
B . a relief valve
C . a fusible plug
D . a bursting ca
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What is the purpose of the STP PortFast BPDU guard feature？（）
A . enforce the placement of the root bridge in the network
B . ensure that a port is transitioned to a forwarding state quickly if a BPDU is received
C . enforce the borders of an STP domain
D . ensure that any BPDUs received are forwarded into the STP domai
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Your ARPA has two guard zones.What is the purpose of the inner guard zone（）.
A . Alert the watch officer that a vessel is approaching the preset CPA limit
B . Warn of small targets that are initially detected closer than the outer guard zone
C . Guard against target loss during critical maneuvering situations
D . Sound an alarm for targets first detected within the zone
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What is the purpose of the STP PortFast BPDU guard feature？ （）
A . enforce the placement of the root bridge in the network
B . ensure that a port is transitioned to a forwarding state quickly if a BPDU is received
C . enforce the borders of an STP domain
D . ensure that any BPDUs received are forwarded into the STP domai
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Commercial ships or other persons or agencies requiring the assistance of Canadian Coast Guard icebreakers should first contact（）.
A . the Canadian Coast Guard
B . Ice Sarnia
C . the Ice Navigation Center
D . the icebreaker assigned to the area
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Which of the following characteristics describe the Root Guard feature？（Choose all that apply.）（）
A . The port must be put into forwarding state manually after root-inconsistent state has beencorrected
B . A Root Guard port receiving superior BPDU goes into a root-inconsistent state
C . A Root Guard port receiving inferior BPDU goes into a root-inconsistent state
D . While the port is in a root-inconsistent state no user data is sent across that port
E . The port returns to a forwarding state if inferior BPDUs stop
F . It should be applied to all switch port
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Which of the following characteristics describe the BPDU Guard feature？（Choose all that apply.）（）
A . A BPDU Guard port should only be configured on ports with PortFast enabled
B . BPDU Guard and PortFast should not be enabled on the same port.
C . BPDU Guard is used to ensure that superior BPDUs are not received on a switch port
D . A BPDU Guard port receiving a BPDU will go into err-disable state
E . A BPDU Guard port receiving a BPDU will be disabled
F . BPDU Guard can be enabled on any switch port
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That uniform makes the guards look absurd.
A . serious
B . ridiculous
C . beautiful
D . impressive
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Which of the following characteristics describe the BPDU Guard feature（）
A . ABPDU Guard port should only be configured on ports with PortFast enabled.
B . BPDU Guard and PortFast should not be enabled on the same port.
C . BPDU Guard is used to ensure that superior BPDUs are not received on a switch port.
D . ABPDU Guard port receiving a BPDU will go into err-disablestate.
E . ABPDU Guard port receiving a BPDU will be disabled.
F . BPDU Guard can be enabled on any switch port.
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Switch R1 has been configured with the root guard feature. What statement is true if the spanning tree enhancement Root Guard is enabled？ （）
A . If BPDUs are not received on a non-designated port， the port is moved into the STP loop- inconsistent blocked state
B . IF BPDUs are received on a PortFast enabled port， the port is disabled.
C . If superior BPDUs are received on a designated port， the interface is placed into the root- inconsistent blocked state.
D . If inferior BPDUs are received on a root port， all blocked ports become alternate paths to the root bride.
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52. Your ARPA has two guard zones. What is the purpose of the inner guard zone?
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The security guards knew how to control the crowd.
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How does the fence indicate her psychological distance with the tinker?
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The ceremony of the Changing of the Guard always takes place at 11 o’clock in the morning.
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\Jump the fence\ refers to _______.
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His trousers ________ when he tried to jump over the fence.
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The security guard ( ) two men that were quarreling in the museum.
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听力原文：The Coast Guard does what its name says; it guards the coasts of the United State
听力原文： The Coast Guard does what its name says; it guards the coasts of the United States. During a war, the Coast Guard becomes part of the United States Navy, and helps to protect against enemy attacks. In times of peace, however, The Coast Guard is part of the United States Department of Transportation. It has responsibility for many different duties. The Coast Guard can be found at many large lakes in America, as well as in coastal waters. It enforces laws controlling navigation, shipping, immigration, and fishing. It enforces other laws that affect the thousands of privately-owned boats in the United States. Coast Guard planes, boats and helicopters search for missing boats and rescue people in dangerous situations. Last year, Coast Guards men saved the lives of almost 7,000 people.
The Coast Guard does scientific research on the ocean. It also uses ice-breaking boats to clear ice from rivers or lakes, so boats can travel safely. One of The Coast Guard's most important duties now is helping to keep illegal drugs out of the United States. Coast Guard boats, armed with guns, use radios and radar to find boats that may be carrying drugs. They stop the boats suspected of carrying drugs and search them, They seize the drugs and arrest the people on the boats. Last year, Coast Guardsman seized more than 800,000 kilo grams of marijuana and cocaine. And-they arrested more than 700 persons trying to bring illegal drugs into the United States.
This kind of action is exiting. Most of the time, however, Coast Guardsman say they see nothing more exciting than the ocean.
(33)
A．Guarding the coasts of the United States.
B．Being part of the United States Navy.
C．Guiding people along the coast.
D．Protecting people from army attack.
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The presence of armed guards usfrom doing anything disruptive（).
A.excited
B.irritated
C.prevented
D.encourage
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The fence is in excellent repair.（)
A.栅栏修好了
B.栅栏很完好
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The fence is only partially successful.
A．YES
B．NO
C．NOT GIVEN
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United States Coast Guard does NOT require the life preserver to bemade_
A．with as few strings as possible
B．capable of being worn on both sides
C．according to each wearer s size
D．confortable and light to we ar
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That uniform makes the guards look<u>absurd.</u>（）
A．serious
B．ridiculous
C．beautiful
D．impressive
