The standard stipulates that the voltage drop of AC cables should be controlled within 3%. When designing a UPS system, it is recommended that the voltage drop of AC cables be controlled within ().
In the air-conditioning system, which of the following is the correct statement about the flow direction of the refrigerant? In this process, the refrigeration system undergoes a process of changing from high- pressure gas to high-pressure liquid, low-pressure liquid, and low-pressure gas.
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