When the AC power equipment is introduced in the three-phase four-wire system, in addition to the grounding of the near end of the power transformer, the near end of the electrical equipment and the equipment room should be grounded repeatedly on the neutral line.
UPS It can purify the mains input, output stable AC, and protect the load.
The access control system can only set the user to open the door, and cannot set when to open the door.
R410A The moment the refrigerant is sprayed to the outside, it can freeze human skin and deep muscles in a very short time, and cause skin necrosis at the frostbite site.
The following four major components that are not air conditioners are ____________ .
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