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You are underway at 5 knots and see on your radar a contact 10 miles directly astern of you. 12 minutes later，the contact is 8 miles directly astern of you. What is the estimated speed of the contact? （）
A . Dead in the water
B . 1 knot
C . 10 knots
D . 15 knot
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The 3-cm radar as compared to a 10-cm radar with similar specifications will（）.
A . give better range performance in rain，hail，etc
B . display small targets in a mass of dense sea clutter at a greater range
C . have less sea return in choppy rough seas
D . display a more maplike presentation for inshore navigatio
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RADAR上出现同芯弧信号，说明SART与RADAR相距：（）
A、100-200米
B、300-500米
C、1海里以上
D、500米-1海里
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Which types of prefixes will a router running BGP most likely advertise to an IBGP peer， assuming it is notconfigured as a route reflector？（）
A . prefixes received from any other BGP peer and prefixes locally originated via network statements or redistributed
B . all prefixes in its routing table
C . prefixes received from EBGP peers and prefixes locally originated via network statements or redistributed
D . prefixes received from EBGP peers and prefixes received from route reflectors
E . prefixes received from other IBGP peers， prefixes received from EBGP peers，and prefixes redistributedto BGP
F . prefixes received from other IBGP peers and prefixes received from route reflector
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Which three statements about BGP confederation and route reflectors are true？ （）
A . Clusters are used in confederation schemes to avoid loops.
B . BGP network can have a confederation within a route reflector area.
C . An internal BGP network cannot have a route reflector within a confederation.
D . An internal BGP network can have a route reflector within a confederation.
E . Clusters are used in route reflector schemes to avoid loops.
F . BGP network cannot have a confederation within a route reflector area.
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If your vessel were proceeding down river (descending)，a green square marker with a green reflector border on the right bank would be a（）.
A . mile board
B . dredging mark
C . passing daymark
D . crossing daymark
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You are underway in restricted visibility and hear a fog signal forward of the beam. Nothing appears on your radar screen. You must（）.
A . stop your engines
B . sound two prolonged blasts of the whistle
C . sound the danger signal
D . slow to bare steerageway
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What best explains the BGP route-reflector function？（）
A . BGP route-reflector should be in forwarding path of data coming from its clients
B . BGP route-reflector does not have to be in the forwarding path of data coming from its clients
C . BGP route-reflector will stop reflecting the routes if they’re not directly-connected clients
D . None of the above
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Which types of prefixes will a router running BGP most likely advertise to an IBGP peer， assuming it is not configured as a route reflector？ （）
A . prefixes received from any other BGP peer and prefixes locally originated via network statements or redistributed
B . all prefixes in its routing table
C . prefixes received from EBGP peers and prefixes locally originated via network statements or redistributed
D . prefixes received from EBGP peers and prefixes received from route reflectors
E . prefixes received from other IBGP peers， prefixes received from EBGP peers， and prefixes redistributed to BGP
F . prefixes received from other IBGP peers and prefixes received from route reflector
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Which types of prefixes will a router running BGP most likely advertise to an IBGP peer， assuming it is not configured as a route reflector？（）
A . prefixes received from any other BGP peer and prefixes locally originated via networkstatements or redistributed
B . all prefixes in its routing table
C . prefixes received from EBGP peers and prefixes locally originated via network statements or redistributed
D . prefixes received from EBGP peers and prefixes received from route reflectors
E . prefixes received from other IBGP peers， prefixes received from EBGP peers，and prefixes redistributed to BGP
F . prefixes received from other IBGP peers and prefixes received from route reflector
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The radio waves used for radar are very short，only（）long.
A . a few centimeters
B . a few fathoms
C . a few meters
D . a few feet
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What action will a BGP route reflector take when it receives a prefix marked with the community attribute NO ADVERTISE from a client peer？（）
A . It will advertise the prefix to all other client peers and non-client peers.
B . It will not advertise the prefix to EBGP peers.
C . It will only advertise the prefix to all other IBGP peers.
D . It will not advertise the prefix to any peers.
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You are scanning the radar screen for a buoy fitted with racon. How should this signal appear on the PPI display?（）
A . Starting with a dash and extending radially outward from the target
B . As a broken line from center of PPI to the target
C . Starting with a dot and extending radially inward from the target
D . Starting with a dash and extending to the right of the target
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AREAS WHICH CANNOT BE SCANNED BY THE RADAR OF THE VESSEL BECAUSE THEY ARE SHIELDED BY PARTS OF ITS SUPERSTRUCTURE，MASTS，ETC means（）.
A . Blind sectors
B . Sheltered area
C . Unseen area
D . Unscanable area
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My radar is not working.I require shore based radar assistance.Is shore based radar assistance（）?
A . used
B . available
C . in use
D . can be used
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The fitting of an efficient radar reflector is likely to considerably increase the ship’s probability of（）.
A . detection
B . being detected
C . the detective
D . the detected
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The 10-cm radar as compared to a 3-cm radar of similar specifications will（）.
A . be more suitable for river and harbor navigation
B . provide better range performance on low lying targets during good weather and calm seas
C . have a wider horizontal beam width
D . have more sea return during rough sea conditio
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当管理员telnet到交换机时提示：Password requied，but none set，可能出现的原因是（）
A . A、硬件问题
B . B、远程登陆密码未设置
C . C、网管机与交换机的管理址不在同一个网段
D . D、远程登陆密码未作加密处理
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When using a radar in a unstabilized mode，fixes are determined most easily from（）.
A . center bearings
B . tangent bearings
C . ranges
D . objects that are close aboard
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反射层reflector
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The radio waves used for radar are very short ， only______long ．
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阅读附件，完成下面填空 Radar and sonar are based on similar……………
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Areas which cannot be scanned by radar of the vessel because they are shielded by parts of its superstructure，masts，etc means ().
A.blind sectors
B.sheltered area
C.unseen area
D.unscanable area
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The basic principle of radar is illustrated by what happens when one shouts in a e. The echoof the shouting 11 the walls helps a person determine the size of i cave. With radar, however , the waves are radio waves instead of 12 waves. dio waves travel 13 the speed of light, about 300,000 kilometers in a second. A lar set 14 a short burst of radio waves. Then it receives the echoes 15 when waves bounce (Silt) off objects. By determining the time it 16 for the echoes to imi to the radar set, a trained technician 17 determine the distance between the [ar set and other objects. The word "radar", 18 , gets its name from the term dio detection and ranging." "Ranging" is the term for detection of the 19 between object and the radar set.
Besides being of critical importance to pilot, radar is 20 for air traffic control, tracking ships at sea, and for tracking weather systems and storms.
11.
A.through
B.for
C.on
D.against
