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名词解释题
噪声控制noise control
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考题
You are the Cisco Network Designer in Cisco.com. Which signal and noise values will result in the best phone communication with an access point?()
A. signal strength 5dBmB. signal strength 6dBmC. noise level 4dBmD. noise level 5dBm
考题
Life gets noisier every day and very few people can free from noise of some sort or another.It doesn′t matter where you live--in the middle of a modem city,or a faraway village--the chances that you will be disturbed by jet aero planes,transistor radios,oil powered engines,etc.,are almost everywhere.We seem to be getting used to noise,too.Some people feel quite lonely without background music while they are working.
Scientific tests have shown that total silence can be very frightening experience for human beings.However,some people enjoy listening to pop music which is very loud,and this can do harm to their eardrums（耳鼓）.The noise level in some disco is far above the usual safety level for heavy industrial areas.
One recent report about noise and concentration（专心）suggested that although a lot of people say that any noise disturbs their concentration,what really affects their ability to concentrate is a change in the level of noise.It goes on to say that a background noise,which doesn′t change too much（music,for example）may even help people to concentrate.
"Background music"in the passage meansA.music played in the concert
B.a kind of noise coming into your ears
C.music which helps people to concentrate
D.music played while people are working
考题
在Enterprise仿真参数设置中，下面属于对于移动终端属性设置的有（）A、Body LossB、Noise FigureC、Power step sizeD、Noise Rise Limit
考题
In the OSNR model for EDFA amplifiers, SNR OUT = 1/(1/SNR IN + FhvB/P IN ), what does SNR IN represent?（）A、the signal to noise of the current optical amplifierB、the signal to noise of the previous amplifier or sourceC、the signal to noise introduced by the optical multiplexerD、the accumulated noise to signal ratio of the optical channel
考题
Which of the following is MOST likely causing an intermittent flashing LED on an IR receiver when the remote control is not being used？（）A、The power supply is faulty and should be replaced.B、The heat from a heating， ventilation， and air conditioning （HVAC） register is being received as infrared noise.C、The radio frequency interference （RFI） is being received as noise.D、A plasma display is emitting infrared noise.
考题
Which signal and noise values will result in the best phone communication with an access point？（）A、 Signal strength 0dBm， noise level 6dBmB、 Signal strength 8dBm， noise level 9dBmC、 Signal strength 4 dBm， noise level 4 dBmD、 Signal strength 6dBm， noise level 5 dBm
考题
Which signal and noise values will result in the best phone communication with an access point?（）A、signal strength 46dBm, noise level 95dBmB、signal strength 74dBm, noise level 94dBmC、signal strength 68dBm, noise level 79dBmD、signal strength 50dBm, noise level 56dBm
考题
You are the Cisco Network Designer in Cisco.com. Which signal and noise values will result in thebest phone communication with an access point？（）A、 signal strength 5dBmB、 signal strength 6dBmC、 noise level 4dBmD、 noise level 5dBm
考题
11. class Animal { public String noise（） { return “peep”； } } 12. class Dog extends Animal { 13. public String noise（） { return “bark”； } 14. } 15. class Cat extends Animal { 16. public String noise（） { return “meow”； } 17. } ..... 30. Animal animal = new Dog（）； 31. Cat cat = （Cat）animal； 32. System.out.printIn（cat.noise（））； What is the result？（） A、 peepB、 barkC、 meowD、 Compilation fails.E、 An exception is thrown at runtime.
考题
单选题11. class Animal { public String noise（） { return “peep”； } } 12. class Dog extends Animal { 13. public String noise（） { return “bark”； } 14. } 15. class Cat extends Animal { 16. public String noise（） { return “meow”； } 17. } ..... 30. Animal animal = new Dog（）； 31. Cat cat = （Cat）animal； 32. System.out.printIn（cat.noise（））； What is the result？（）A
peepB
barkC
meowD
Compilation fails.E
An exception is thrown at runtime.
考题
单选题In the OSNR model for EDFA amplifiers， SNR OUT = 1/（1/SNR IN + FhvB/P IN ）， what does SNR IN represent？（）A
the signal to noise of the current optical amplifierB
the signal to noise of the previous amplifier or sourceC
the signal to noise introduced by the optical multiplexerD
the accumulated noise to signal ratio of the optical channel
考题
单选题Which of the following is MOST likely causing an intermittent flashing LED on an IR receiver when the remote control is not being used？（）A
The power supply is faulty and should be replaced.B
The heat from a heating， ventilation， and air conditioning （HVAC） register is being received as infrared noise.C
The radio frequency interference （RFI） is being received as noise.D
A plasma display is emitting infrared noise.
考题
单选题In the OSNR model for EDFA amplifiers, SNR OUT = 1/(1/SNR IN + FhvB/P IN ), what does SNR IN represent?（）A
the signal to noise of the current optical amplifierB
the signal to noise of the previous amplifier or sourceC
the signal to noise introduced by the optical multiplexerD
the accumulated noise to signal ratio of the optical channel
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