30. Which device is used to provide a limited amount of electric power for a finite periods of time to
certain loads in case of a power failure on its supply side, with no break in the flow of power to the
loads？
(A) Power governor
(B) Transformer
(C) Solid-state power converter
(D) Uninterruptible power supply
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哪個設備用於在其供電側斷電的情況下在有限...
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