PLE Defined as the power consumption of the data center power supply and distribution system and IT The ratio of the power consumption of the device.

For valve-regulated lead-acid batteries, the function of the safety valve is ____________ .

During the construction process, work in contact with sharp instruments and use ____________ .

MCB Circuit breakers can be divided into different tripping characteristics B, C, D, Z, K Level, for IT For load, you should use ____________ class Tripping characteristics.

The function of the following () parts is to help with oil return.