89. Cellphone is a common device in people’s daily life. When it runs out of power, people need to recharge it. The common scheme is to use a charger, which intakes 110 volt and provides roughly how many volt output to the cellphone?
(A)0.05 Volt
(B)0.5 Volt
(C)5.0 Volts
(D)50 Volts

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統計: A(4), B(18), C(106), D(3), E(0) #2319613

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#5462989
Usb 充電係使用5V
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