.On Sundays there were a lot of children playing in the park, _______ parents seated together joking

题干

. On Sundays there were a lot of children playing in the park, _______ parents seated together joking.

A：their

B：whose

C：which

D：that

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A

小明同学对串联电路电压规律进行了探究【猜想与假设】串联电路总电压等于各用电器两端的电压之和

【设计与进行实验】（1）按图所示的电路图连接电路．

（2）闭合开关，用电压表测出L₁两端的电压，并将数据记录表（3）仿照（2）分别测出BC和AC两端的电压，并将数据记录表

U_AB/V	U_BC/V	U_AC/V
2.4	1.4	3.8

过分析表实验数据，小明得出结论：串联电路的总电压等于各用电器两端电压之和．小明的实验存在着一些错误，请你根据小明整个实验过程，指出小明实验中的错误是：