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宁夏1993年初中毕业会考暨高中招生物理第32题为:如图所示,两根电阻丝串联,电阻 Ra=100R_b,在它们的上面放有 ab 两根火柴,通
The 32nd title of the Ningxia Middle School 1993 graduation quiz and high school enrollment physics is: As shown in the figure, two resistance wires are connected in series, and the resistance is Ra=100R_b. There are two matches on the top of them.