在如图所示的电路中,开关S闭合后,由于电阻元件发生短路或断路

在如图所示的电路中,开关S闭合后,由于电阻元件发生短路或断路故障,电压表和电流表的读数都增大,则可能出现了下列哪种故障(      )

AR1短路              BR2短路

CR3短路              DR1断路

答案

A

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