问题
选择题
-Can you find me one size bigger? It’s .
-How about this one? [ ]
A. too small to wear for me
B. small enough for me to wear
C. too small for me to wear
D. small enough to wear for me
答案
答案：C
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的导线直接连在一电池的两极，当给它并联一个电阻时，导线的电流减为原来的二分之一，而通过电池的电流变为原来的两倍，问后加的那个分路的电阻是多少?电池的内电阻是多少?
