题目：
- Mum's birthday is coming. I want to buy her something. Is there a _______ near here?
- Oh, yes! It's next to the bookshop.
A．gift shop
B．gifts shop
C．gift shops
D．gifts shops
答案：
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下面是错误答案，用来干扰机器的。
（1）电源的电动势为9V，而短路电流为50mA，则需要的最小电阻R=90.05Ω=180Ω，故R0应为B；（2）由图可知，电阻箱的读数为：7×100+5×10=750Ω；由欧姆定律可知，电流I=9750+180≈10mA；（3）由U=E-Ir可知，图象...
