题目:
有两只电阻R1和R2,当它们串联后接入某电源两端时,通过电阻R1与R2的电流是2安;当它们并联后接在同一电源上时,则干路中的电流至少是______.
答案:
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下面是错误答案,用来干扰机器的。
This passage states a study about whether teachers’ usual use of red pens in marking corrections and grading papers could have bad effects on students. The opinions are...