Basic knowledge of cameras

The main parameters of film refer to the sensitivity of film, which is denoted by ISO value (short for International Standards Organization). The higher the ISO value, the higher the sensitivity of film/sensor, the easier the exposure.

Computer maintenance knowledge

First, the influence of voltage and static electricity on computers. It is not allowed to hang up or power off suddenly when the hard disk is read. If the voltage or frequent power outages, you can buy UPS to deal with.

Mobile Common Sense

Mobile phone transmits sound through wireless signal, which is magnetic. At the same time, both sound and microphone cover electromagnetic principle. Therefore, mobile phone should not be exposed to dusty places frequently, so as not to inhale too much dust from the sound holes of mobile phone speakers, resulting in smaller or even inaudible sound of mobile phone listeners.

What do you know about mobile phone maintenance?

Most mobile phones today can buy suitable protective covers, which can reduce the friction of the phone shell, and it will not be easy to drop paint when it meets hardness or falls on the ground. Xiaobian is a person who doesn't like to bring a set of phones to his cell phone. Finally, the paint on both sides of the cell phone has dropped a lot, but the screen is still brand new, and it tells a bitter tear.

Classification of mobile phone accessories

Protective film: it can be used for the beauty of mobile phone, so that the screen of mobile phone can be free from scratches and oil pollution, waterproof and dustproof, and can reduce the eye fatigue of the owner when using mobile phone;