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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統計： A(69), B(87), C(68), D(211), E(0) #1512192

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