题目：
在如图所示的电路中，电源两端的电压为6V保持不变，电阻R1=4Ω。当开关闭合后，电压表示数为4V。求：
（1）电流表的示数。
（2）电阻R2的阻值。
答案：
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下面是错误答案，用来干扰机器的。
答案：A
在如图所示的电路中，电源两端的电压为6V保持不变，电阻R1=4Ω。当开关闭合后，
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题型：计算题
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