Display the Voltage and Frequency of two suppliers.

It can be widely Used in high ways , building , post , coal , nines, ships health care , military facilities , and so on .

It can be widely Used in high ways , building , post , coal , nines, ships health care , military facilities , and so on .

It can be widely Used in high ways , building , post , coal , nines, ships health care , military facilities , and so on .