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【单选题】
如图所示,在探究串联电路中的电压关系时,小用电压表测出 ab 、 bc 、 ac 两端的电压分别为 U ab =2V 、 U bc =2V 、 U ac =4V ,在表格中记录下数据后,下一步应该做的是( )。A.
整理器材，结束实验
B.
分析数据，得出结论
C.
换用不同规格的小灯泡，再测出几组电压值
D.
换用电压表的另一量程，再测出一组电压值
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