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If several fixed navigational lights are visible at the same time, each one may be positively identified by checking all of the following EXCEPT what against the Light List?______.
A.Rhythm
B.Period
C.Intensity
D.Color
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更多 “ If several fixed navigational lights are visible at the same time, each one may be positively identified by checking all of the following EXCEPT what against the Light List?______.A.RhythmB.PeriodC.IntensityD.Color ” 相关考题
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The TCP protocolis a (71) layer protocol. Each connection connects two TCPs that may be just one physical network apart or located on opposite sides ofthe globe. In other words, each connection creates a (72) witha length that may be totally different from another path created by another connection. This means that TCP cannot use the same retransmission time for all connections. Selecting afixed retransnussion time for all connections can result in serious consequences. Ifthe retransmission time does not allow enough time for a (73) to reach the destination and an acknowledgment to reach the source, it can result in retransmission of segments that are still on the way. Conversely, if the retransnussion time is longer than necessary for a short path, it may result in delay for the application programs.Even for one single connection, the retransmission time should not be fixed.A connection may be able to send segments and receive (74)faster during nontraffic period than during congested periods. TCP uses the dynamic retransmission time,a transmission time is different for each connection and which may be changed during the same connection. Retransmission time can be made(75) by basing it on the round-trip time (RTT). Several formulas are used for this purpose.A.physicalB.networkC.transportD.application@@@SXB@@@A.pathB.windowC.responseD.process@@@SXB@@@A.processB.segmentC.programD.user@@@SXB@@@A.connectionsB.requestsC.acknowledgmentsD.datagrams@@@SXB@@@A.longB.shortC.fixedD.dynamic
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Even for one single connection, the retransmission time should not be fixed.A connection may be able to send segments and receive （74）faster during nontraffic period than during congested periods. TCP uses the dynamic retransmission time,a transmission time is different for each connection and which may be changed during the same connection.
A.connections
B.requests
C.acknowledgments
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In other words, each connection creates a （72） witha length that may be totally different from another path created by another connection. This means that TCP cannot use the same retransmission time for all connections.
A.path
B.window
C.response
D.process
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Retransmission time can be made（75） by basing it on the round-trip time （RTT）. Several formulas are used for this purpose.
A.long
B.short
C.fixed
D.dynamic
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单选题A vessel may exhibit lights other than those prescribed by the Rules as long as the additional lights（）.A
are not the same color as either side lightB
have a lesser range of visibility than the prescribed lightsC
do not impair the visibility or distinctive character of the prescribed lightsD
All of the above
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单选题Many navigational warnings are of a temporary nature，but others remain in force for several months or may be succeeded by（）.A
Notices to MarinersB
Sailing DirectionsC
List of Lights and SignalsD
Guide to Port Entries
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填空题To many people,a linguist is the same as a （）,one who can speak several languages fluently.
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单选题A vessel is approaching from dead ahead． Both of her sidelights are visible and her range lights are in line. Which of the following could you do first?（）.A
Sound one blast of the whistleB
Alter course to starboardC
Construct a radar plotD
Sound the danger signal
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问答题Cultural Attitudes towards Time According to anthropologist Irving Hallowell, there is no evidence that humans have an inborn sense of time. A person’s temporal concepts are probably determined largely by culture. One study showed that infants, after a few days of listening to speech around them, will move their heads and limbs in rhythm with the speech they hear. As children develop, they adapt more fully to their temporal culture. This temporal culture influences language, music, poetry and dance. It also affects relationships. We tend to get along well with people who share our sense of time. One particular cultural attitude towards time is found in polychronic cultures. Some Mediterranean and southwest Asian Cultures are usually placed in this category. Such cultures emphasise relationships among people, flexible timing of appointments, and the careful completion of processes rather than strict schedules. Polychronic people seldom feel that time is being wasted. They tend to consider each activity valuable on its own, not just as part of a larger process. Polychronic people tend to have many projects going on at the same time, and they may shift frequently from one task to another. They change plans often. For polychronic people, work time is not clearly separable from personal time, so business meetings are considered a form of socialising. Monochronic cultures, on the other hand, are oriented towards tasks and schedules. Cultures usually considered monochromic can be found in northern Europe, North America, and some parts of eastern Asia. Monochronic people feel that time is tangible and inflexible and that “time is money.” They do one thing at a time and concentrate on each thing. Time and job commitments are very important to them and they tend to follow plans rigidly. Also, monochromic people clearly separate their work and personal time, and they place a high value on privacy. As you might expect, people from polychronic and monochromic cultures often misunderstand each other because of their different senses of time. For example, because a monochromic culture is highly compartmentalized, monochromic people tend to sequence conversations as well as tasks. They would not, for instance, interrupt a phone call in order to greet another person who just came into the room In contrast, polychronic people are comfortable with having multiple conversations at the same time. They would consider it rude not to greet someone who entered during a phone conversation. Complete the summary below by choosing for each blank no more than three words from the passage. Cultures may have either a 1 or a monochromic conception of time. Cultures with a polychromic view of time follow a 2 timetable. People from polychronic cultures tend to work on severa 3 at the same time. On the other hand, people in 4 perceive events and tasks as being more compartmentalized. In this culture, jobs and even conversations should follow a certain 5 Everything in these cultures seems inflexible, and has its own place and time.
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单选题A vessel constrained by her draft may display（）.A
three all-round red lights instead of the lights required for a power-driven vessel of her classB
the same lights as a vessel restricted in her ability to maneuverC
three all-round red lights in addition to the lights required for a power-driven vessel of her classD
the lights for a power-driven vessel which is not under command
考题
单选题If several fixed navigational lights are visible at the same time，each one may be positively identified by checking all of the following EXCEPT what against the Light List?（）A
RhythmB
PeriodC
IntensityD
Color
考题
单选题A compound fracture is a fracture in which（）.A
more than one bone is brokenB
the same bone is broken in more than one placeC
there is never any internal bleedingD
the bone may be visible
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单选题Two navigational hazards are located near to each other，but each is marked by an individual cardinal buoyage system. The buoys of one cardinal system may be identified from the other system by（）.A
the differing light colorsB
one system having odd numbers while the other system has even numbersC
one system using horizontal bands while the other system uses vertical stripesD
the difference in the periods of the light
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单选题The ARPA may swap targets when automatically tracking if two targets（）A
are tracked on reciprocal bearingsB
are tracked at the same rangeC
are tracked on the same bearingD
pass closely to each other
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单选题On navigational aids，what does the light characteristic Fl(2+1) mean?（）A
A flashing light combined with a fixed light of greater brightnessB
Light flashes combined in groups，with a different number of flashes in each groupC
A light showing groups of two or more flashes at regular intervalsD
A fixed light varied at regular intervals by groups of two or more flashes of greater brightness
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单选题A common rail engine has only one or two high pressure pumps in operation at the same（）time, and the injection into each cylinder.A
can’t be controlled very preciselyB
can’t be controlled as flexibly as the separate pump systemC
can be controlled as flexibly as the separate pump systemD
can be controlled more precisely and flexibly
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