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if the single-channel transmission rate of a WDM system goes up to 2.5G or above, the phenomenon of （）will take place.
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更多 “if the single-channel transmission rate of a WDM system goes up to 2.5G or above, the phenomenon of （）will take place.” 相关考题
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Present value measuresA.the value to us today of future cash flows.B.the rate of return on an investment when we take account of cash inflows and outflowsC.the current estimates of our project budgetD.the dollars worth of work accomplished as of todayE.All of the above.
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Television is a ______ in the transmission of message.A．senderB．receiverC．transmitting deviceD．none of the above
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Although a given waveform. may contain frequencies over a very broad range，as a practical matter any transmission system will be able to accommodate only a limited band of (71) ．This，in turn，limits the data rate that can be carried on the transmission (72) ．Asquare wave has an infinite number of frequency components and hence an infinite (73) ．However, the peak amplitude of the kth frequency component，kf，is only 1/k，so most of the (74) in this wavefonn is in the first few fiequency components．In general，any digitalwaveform. will have (75) bandwidth．If we attempt to transmit this waveform. as a signalover any medium，the transmission system will limit the bandwidth that can be transmitte（71）A．frequenciesB．connectionsC．diagramsD．resources
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With the price of oil _______, the economy of oil－producing countries is expanding at a high rate.
A.going upB.goes upC.gone upD.to go up
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The statements concerning nominal and real interest rate are true except that ______.A．the nominal interest rate is the growth rate of your moneyB．the real interest rate is the growth rate of your purchasing powerC．the nominal rate is the real interest rate deducted by the rate of inflationD．all of the above statements
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Which of the following statements regarding ISDN are correct?()
A. Each ISDN B channel has transmission speeds of up to 64 kbps.B. The ISDN B channel can carry video, voice or data.C. The ISDN B channel transmission rate varies depending on the service used.D. The ISDN D channel transmits control information.E. The ISDN B channels can be configured with different subnets and encapsulation types when dialer profiles are configured.
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Which action should be taken on receipt of a GMDSS distress alert ________．A.Read the display screen and/or printoutB.Silence the alarmC.Listen for any follow up voice/telex transmission on the appropriate frequencyD.All of the above
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Company.com with a newly installed cluster has been checking the logfiles to determine if the cluster has had any recent activity. The non-IP RS232 heartbeat connection seems to be having a difficulty. The serial network goes down，and then a couple of minutes later comes back up again. This pattern is repeated many times in the log. If this system was installed without regard to best practices， what is the most likely problem with the serial network？（） A、 The serial port is malfunctioning and needs to be repaired.B、 The baud rate is incorrectly specified in the AIX devices configuration.C、 The serial port is not a port approved to support HACMP heartbeat traffic.D、 The baud rate is incorrectly specified in the HACMP interface configuration.
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The WDM components making up a WDM system should meet the following requirements .（）A、插入损耗低 Low insertion lossB、具有良好的带通特性 Excellent bandpass propertyC、温度稳定性好 Performance stability in spite of temperature changeD、复用通路数多A number of multiplexing channelsE、具有较高的分辨率 High resolutionF、几何尺寸小 Small size
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The ZXMP M900 is applicable to ultra long-haul transmission and the system reach can be up to （） at the maximum 。A、640kmB、2000kmC、560kmD、800km
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Which statements are true regarding ISDN channels?（）A、Each B channel can transmit up to 64 kbpsB、The ISDN B channel carries voice or dataC、The ISDN D channel transmits control information.D、The D channel transmission rate varies depending on the service used.E、HDLC or PPP can be used to encapsulate D channel information.
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Which color does the router assign to packets received at a datarate that is above the committed rate but is below the peak rate?（）A、redB、whiteC、greenD、yellow
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Which of the following are included in a transportable tablespace set？（） A、 The datafiles that make up a self-contained group of tablespaces required for copyB、 The system tablespaceC、 An export of the tablespace metadataD、 The spfileE、 All of the above
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Two data files have been deleted at the operating system level by accident. Your database is running in ARCHIVELOG mode and online backups are taken nightly. One of the data files that has been deleted belongs to the USERS tablespace on the other belongs to the SYSTEM tablespace. How can you recover from this situation？（）A、Shut down the database, restore the two data files and then start up the database. B、Take the system and users tablespace offline, restore the two data files, recover the two datafiles, and then bring the SYSTEM and USERS tablespaces online. C、Shut down the database, restore the two data files, start up the database in MOUNT mode, recover the two data files, and then alter the database open. D、Take the SYSTEM and USERS tablespaces offline, recover the two datafiles and then bring the SYSTEM and USERS tablespaces online.
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Rate your level of proficiency with restoring and backing up Windows XP Professional， system state data， and user data.（）A、Very HighB、HighC、ModerateD、LowE、Very Low
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单选题（）conveys a signal of desired rudder angle from the bridge and activates the power unit and transmission system unit the desired angle is reached.A
The control equipmentB
The power unitC
The transmission systemD
The follow-up mechanism
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单选题Air trapped in the hydraulic fluid of a steering system would be indicated by（）A
an improper rudder responseB
hammering noises in the equipment or transmission linesC
popping or sputtering noisesD
all the above
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单选题Which action should be taken on receipt of a GMDSS distress alert（）.A
Read the display screen and/or printoutB
Silence the alarmC
Listen for any follow up voice/telex transmission on the appropriate frequencyD
All of the above
考题
单选题A group of hikers is planning a trip that will take them up a mountain using one route and back down using another route. They plan to travel down the mountain at a rate of one and a half times the rate they will use on the way up, but the time each route will take is the same. If they will go up the mountain at a rate of 4 miles per day and it will take them two days, how many miles long is the route down the mountain?A
4B
6C
8D
12E
16
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多选题Which of the following are included in a transportable tablespace set？（）AThe datafiles that make up a self-contained group of tablespaces required for copyBThe system tablespaceCAn export of the tablespace metadataDThe spfileEAll of the above
考题
多选题Which statements are true regarding ISDN channels?（）AEach B channel can transmit up to 64 kbpsBThe ISDN B channel carries voice or dataCThe ISDN D channel transmits control information.DThe D channel transmission rate varies depending on the service used.EHDLC or PPP can be used to encapsulate D channel information.
考题
单选题There are some back-up satellites in the event of failure. If the operational satellite is out of work,（）.A
communications in the whole system will stopB
the global system will be damagedC
the back-up one will take its placeD
the whole system will not work
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单选题The water pockets located on the underside of inflatable liferafts（）.A
stow rainwater; these 4 spaces do not take up valuable spaceB
act as stabilizers by filling with sea water as soon as the raft is inflated and uprightC
hold the freshwater required by regulation to be provided in the raft when packedD
None of the above
考题
多选题Which of the following statements regarding ISDN are correct?（）AEach ISDN B channel has transmission speeds of up to 64 kbps.BThe ISDN B channel can carry video, voice or data.CThe ISDN B channel transmission rate varies depending on the service used.DThe ISDN D channel transmits control information.EThe ISDN B channels can be configured with different subnets and encapsulation types when dialer profiles are configured.
考题
单选题Rate your level of proficiency with restoring and backing up Windows XP Professional， system state data， and user data.（）A
Very HighB
HighC
ModerateD
LowE
Very Low
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