在物理实验中，对物理量进行多次测量，有的是为了通过多次测量提高精度，有的是为了通过多次测量寻找规律。下面四个实验中，哪个是通过多次测量提高精度（ ）
A：在探究“并联电路中干路电流与各支路电流的关系”时测量多组对应的干路电流和各支路电流
B：在探究“串联电路各点间电压的关系”时测量多组对应的总电压和各部分电路两端的电压
C：在探究“电阻上的电流跟两端电压的关系”时测量多组对应的电流和电压值
D：在“测量定值定值的电阻”时，测量多组对应的电流和电压值
根据短文理解选择正确答案。
Here is a timetable of science activities in the Children's Palace of Xiangtan city.
Timetable
Monday
Space and Man(1 weeks)
19: 00—21: 30
Dr. Li Bin (Hunan Science and Technology University)
Would you like to know more about the outer space?
Thursday
Modern Medicine(4 weeks)
19: 00—21: 00
Dr. Zhu Jiankang (Xiangtan Central Hospital)
Would you like to know medical advances(进步)?
Tuesday
Photography(5 weeks)
18: 30—20: 30
Mr. Chen Yi, from Xiangtan Daily, will show you how to take good pictures. Please bring your own camera.
Saturday
Technical English(16 weeks)
14: 00—17: 00
Dr. Rose White Do you want to learn the technical words and articles?
Wednesday
Computer Science
18: 30—21: 00
Prof. Han Lin from Xiangtan University Learn how to use Office 2010.(3 weeks)
Sunday
Exhibition(展览)of Personal Inventions
8: 30—11: 30
You can see many inventions by the students; you may also bring your own inventions.(2 weeks)
— Lily is about the competition.
— Yes, she is afraid that she won't win.
