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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.
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11- 28
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.
