如图,直线l:y=√3/3x+√3/3与x轴、y轴分别交于点B、C,以点A（1,0）为圆心,以AB的长为半径作⊙A,分别

如图,直线l:y=√3/3x+√3/3与x轴、y轴分别交于点B、C,以点A（1,0）为圆心,以AB的长为半径作⊙A,分别交x轴、y轴正半轴于点D、E,直线l与⊙A交于点F,分别过点B、F作⊙A的切线交于点M.
于点N,设PB=a,MN=b,求b与a的函数关系式,并写出自变量a的取值范围. 113275526 1年前他留下的回答 已收到1个回答

x仙宠 网友

该名网友总共回答了16个问题，此问答他的回答如下：采纳率：81.3%

1.Idle power consumption of resources
When a computer starts,not always running at full capacity,so there will be a lot of free time,so the idle time power consumption becomes an important power management technology.In win7,the idle power consumption has been effectively improved,when a hardware is not working after a certain time will enter a low power state has power saving purposes.Including the CPU,cheap nike air max 90 shoes,hard drive,memory and network elements have adopted this technology.For example,nike air max,a full-power operation of the CPU power consumption 35w power consumption during idle time is almost 0,only this one will be able to save a lot of power.
2.Through the trigger to start the service
System services are typically when the system starts with the start,and then resides in the background waiting to call.In windows 7,the service is only part of the system until triggered by some event started,such as inserting a device or change the IP.This background process can reduce the number of services in the long run.
3.Increased processor power management
win7 in the integration of the latest power management technology,mens nike air max,which allows Windows 7 based on the current load conditions and performance requirements to dynamically adjust the CPU performance.
4.Adaptive display brightness adjustment
Microsoft said the time is usually 10-15 minutes if no operation,the display will automatically shut down.However,in practice there will be more short-term use of non-operating condition,in order to better energy efficiency,the technology will reduce the display brightness.In addition,it could use some sensing devices to adjust the brightness according to ambient brightness of the display.
5.Low Power Audio
win7 will support low-power Intel HD Audio specification,it allows codec into low power state.win7 also supports selective suspend technology,the device is turned off at idle,such as microphones and cameras such USB devices.
6.Timer integrated
The current processor instruction through the use of the gap processing time to spare to save energy,but most energy-saving technologies require a certain length of idle time to get energy-saving effect.And this technology by making the Windows kernel to terminate at the same time and focus more dispersed than the original timer,disposed of in a short time,thus increasing the processor's idle time.
In addition,when the laptop in case of battery,win7 daemon will reduce the activities of non-critical frequency.
7.Bluetooth devices to improve power
When win7 Bluetooth device is detected in a low power state when they will be temporarily closed,the "selective suspend."
8.Network equipment to improve power
win7 in the radio network controller for low-power mode compatibility has been enhanced,and only in the wireless AP devices support the case of low-power mode will be enabled.Vista because it can not detect in advance whether to support low-power mode,the wireless network connection will lead to a sudden interruption.win7 will prevent this from happening,before entering the low power mode will first detect whether the wireless AP to support the model.
9.A typical application of the optimization program
In addition to the above listed improvements,Microsoft also turned to some specific applications,including search,browse without networking and small game.Here is where DVD player part of the optimization program:
Does not affect the playback performance in the premise of maintaining low power mode to CPU
By changing the structure to improve the desktop window manager and GPU power consumption
Intelligent data caching can reduce the drive speed
These are the power management win7 9 in important improvements,compared to the previous system can save more power.In addition to these improvements,IT professionals can also be diagnosed with power management that may affect the power efficiency to find the problem.

1年前他留下的回答

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