BTC audio

1. Mai Dian mall is not a virtual currency on the Internet. It's like a mall. It's said to be a pyramid selling mall
network virtual currency generally includes game currency and digital currency
digital currency generally refers to bitcoin, Leyte coin, dogcoin and project crowdfunding token of European crowdfunding platform.

2. BTC (business to customer) is one of the categories of e-commerce according to the trading partners, which means the e-commerce of commercial institutions to consumers. This form of e-commerce is generally based on the network retail instry, mainly with the help of the Internet to carry out online sales activities. B2C mode is the earliest e-commerce mode in China, marked by the formal operation of 8848 online mall. B2C means that enterprises provide consumers with a new shopping environment through the Internet - online store, where consumers shop online and pay online. Because this mode saves the time and space of customers and enterprises, and greatly improves the transaction efficiency, especially for busy office workers, this mode can save valuable time. However, the characteristics of goods sold on the Internet are also very obvious, which are limited to some special goods, such as books, audio-visual procts, digital procts, flowers, toys and so on. These commodities demand less experience for buyers to feel, listen, touch, smell and so on. For example, clothing, sound equipment and perfume need consumers' specific sensory experience procts not suitable for sale online. Of course, they do not exclude a small number of consumers who decide to buy a certain brand of a brand without having to live experience, but such consumers are few. Especially in China, the proct quality management system is not perfect, people are more willing to believe their own experience to decide whether to buy. So far, successful enterprises in B2C market, such as Dangdang and Zhuoyue, sell some special commodities. At present, the payment method of B2C e-commerce is the combination of cash on delivery and online payment, and most enterprises choose logistics outsourcing to save operating costs. With the change of users' consumption habits and the promotion of excellent enterprise demonstration effect, online shopping users grow rapidly, accounting for 5.4% of the total Internet users in 2004. By the end of 2004, China's B2C e-commerce market reached 4.5 billion yuan, and this business model has been basically mature in China.

3. Installation of audio is nothing more than to create a good audio-visual environment, but vehicle modification of audio is not to say that the light is good, expensive is hard conditions! In fact, the vehicle itself is also to carry out some transformation, to rece the noise of the vehicle, to ensure that the noise inside the car will not be too big! There is the sound itself! Due to the limitation of automobile working environment, it is difficult to install and use audio-visual devices in automobiles. First, in the process of radio receiving and transmitting, the radio wave intensity is unstable e to the influence of terrain, location, time, climate and other factors; Second, the interior space of the car is too narrow, the windows and interior components form a disordered environment of sound, and the position of the passengers relative to the horn is unbalanced; Third, the higher the sensitivity of radio reception, the higher the authenticity of sound characteristics, and the electrical noise emitted by automobile electrical devices will be easily accepted; Fourth, e to the influence of heat and radiation, the performance of components is unstable; Fifthly, the vibration and impact of the car can easily cause the distortion and distortion of the CD. Therefore, the audition equipment installed in the car should have the following special requirements: (1) DC power supply should be used. The power supply of the car audition device is the 12 V battery on the car, so it must use direct current 2) The anti-jamming performance should be strong. Because the ignition device of automobile engine and other electrical appliances share one automobile battery, it has great interference to AM / FM (amplitude molation / frequency molation) reception. Therefore, it is necessary to use wires and components with strong anti-interference performance. Generally, the power supply of car audio has a choke, and the enclosure must be isolated by a fully sealed grounding iron shell 3) The seismic performance is better. When a car runs on different roads, it vibrates a lot to the audio-visual device of the car. In order to make the components welded and assembled firmly, the pins should be bent and welded as far as possible 4) The antenna is external. In order to rece the interference of the car engine to the radio, the external rod antenna is generally used. When the antenna is damaged, the radio will not receive the radio 5) Dust proof measures should be taken. When the car is running, there is a lot of st, so the audio-visual device needs to be packaged to prevent or rece the impact of st 6) Choose heat resistant components. Due to the high temperature in the car, the audio-visual device is difficult to dissipate heat, so the selected components have better heat resistance and work stably 7) The acceptance sensitivity should be high. The car cab has shielding effect, and the car is running fast, sometimes far away from the transmitting station, so the receiving sensitivity of the broadcast is required to be high 8) Inctive tuning is adopted. In order to prevent the influence of vehicle vibration on tuning ring driving, inctive tuning should be adopted for vehicle radio 9) Low impedance high power horn is adopted. In order to obtain higher power, in addition to BTC mode, the horn uses 1.6 ~ 4 ohm low impedance high power horn and thick horn lead. The diameter of the horn is mostly 10-15 cm. Advanced car audio uses coaxial 2 dB or 3 dB 15 ~ 20 cm speakers 10) With luminous lighting function. When the car is driving at night, for the convenience of radio and playback, the keys should be equipped with light transmission lighting. The design of this lighting device should not affect the effect of LCD digital display 11) The volume requirement is small. As the car is limited by the internal space, the volume of audio-visual device should be designed as small as possible. Therefore, the choice of mechanical parts and electronic components, should use small, good heat dissipation.

4. KTV, Lanzhou city to say the environment is good, sound effect is good, plus songs, songs, it is estimated that the Western cash box and pure
the KTV of the Western cashbox in Zhongshan forest, buy out from 12:00 to 19:00, Xiaobao 31, Zhongbao 39
the pure KTV on Gannan road is bought out from 13:00 to 20:00. I forgot how much it is. Anyway, it's more expensive than the cash box

other sounds like the sounds of nature in Xiguan have no sound effect
the supreme song is old and young
happily, although it's cheap, it's almost the worst in Lanzhou. We haven't been in it for several years. The environment is poor and the service attitude is poor. The song is old and young. Let's not say, the sound effect is bad. I can't stand it. Don't try to be cheap anyway
it's not as good as the two I recommended to you

do it yourself. ha-ha.

5. Configuration type: home learning type
accessory category proct name price
CPU Intel Celeron D315 2.26g (bulk) 270.00
motherboard elite 945pl-a 688.00
memory Kingston 256MB DDRII 533 200.00
hard disk Seagate coldfish 7200.7 80g 7200 to 8m (serial port) 415.00
CD-ROM Samsung golden general 16x DVD recorder (black gold version) ts-h552d 359.00
video card Seven rainbow radium wind 9550 ch gold 440.00
speaker rambler r103t 110.00
keyboard and mouse set colorful k7008p + m308bp office master enhanced version 75.00
LCD B71 1499.00
total: 4056
because you said that you have plans to upgrade in the future, specially selected a 945 motherboard for you, after this motherboard you can upgrade absolutely, because Your requirements are not high, so I chose a CPU with enough memory for you.
the memory is only 256M. If you don't play games, it's enough. A hard disk is in place. If you choose 8m serial port, you don't need to move after upgrading. The chassis doesn't choose DVD recorder. The display is LCD, but I suggest that the memory should be changed to 512M.
that's all

6. BTC area in bit age

7. The overall quality of patients in rehabilitation institutions is absolutely higher than that in hospitals. Hangzhou Yuhang green city shuangci hospital, established on March 28, 2018, is located at No. 570, Donghu North Road, Yunhe street, Yuhang District, Hangzhou. It is a comprehensive medical service hospital combining medical and nursing. You can ask me if you don't understand

8. Hospitals will be more professional, because doctors are in contact with patients every day, and need to be certified, and doctors who can enter public hospitals will not be too bad. Training institutions may only have solid theories.