A power supply support system comprises a battery pack comprising a variably positionable support arm configured to support an electronic device in a plurality of different viewing orientations. When the input speech is not input during a period starting from the reception of the start instruction till an elapse of the first determination period, the response control unit instructs the output unit to output the first response again. According to the process for producing perfluorocarbons of the present invention, high-purity perfluorocarbons extremely suppressed in the production of impurities such as an oxygen-containing compound can be obtained. The display module comprises a connecting end combined with the sliding element and a support plane. In another process, the device may be used to remove alloys from metals.