问题
选择题
What's her name? [ ]
A. Her name is Amy.
B. My name is John.
C. His name is John.
答案
答案：A
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What's her name? [ ]
A. Her name is Amy.
B. My name is John.
C. His name is John.
答案：A
在做“决定电阻大小的因素“实验中，为了便于研究，采用______法，即每次需挑选两根合适的导线，测出通过它们的电流，然后进行比较，最后得出结论：
| 导线代号 | A | B | C | D | E | F | G |
| 长度l/m | 1.0 | 1.2 | 1.5 | 1.0 | 1.2 | 1.5 | 0.5 |
| 横截面积S/mm2 | 3.2 | 0.8 | 1.2 | 0.8 | 1.2 | 1.2 | 1.2 |
| 材料 | 锰铜 | 钨 | 镍铬 | 锰铜 | 钨 | 锰铜 | 镍铬 |
（2）为了研究电阻与导体的横截面积有关，应选用的两根导线是______．