电路如图所示,电流表的量程为0~0.6A,电压表的量程为0~3V,电源电压9V保持不变,滑动变阻器的最大阻值为50Ω,定值电阻R0为10Ω,S闭合后,在确保电路安全的情况下,正确的说法是 ( )
看一看,找一找,前面三道题的答案已经给出来,请直接选择第四道题的答案( )
—Wonderful! I think it is an interesting TV show that many people like watching it.