It may or may not be connected to earth ground.
实际上它可能连接也可能未连接到底。
In general, only one point in the measurement system should be connected to earth ground to avoid ground loops.
一般而言,在测量系统中应该只有一个点被连接到接地,以避免形成接地回路。
The earth wire of the UPS must then be connected to an efficient earth system.
UPS的地线必须与有效的接地系统连接。
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