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(3分)如图所示，电源电压不变，R1和R2是两段长度相同、材料相同的电阻丝，R2=40Ω.闭合开关S，断开开关S1,电流表的示数是0.2A;若再闭合S1，电流表的示数是0.6A，则电源电压为 ______V。开关都闭合时，通过R1和R2的电流之比为_____ ，电阻丝 (选填“R1”或“R2” 的横截面积较大。 此题出自山东淄博市2015年中考物理真题及答案 ,淄博市2015年初中学业考试物理试题
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【判断题】Spoken material is often heard many times in most cases like written material.
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正确
B.
错误
【简答题】Scientists have been trying to make soft and friendly robots, like Disney's Baymax, for years. And they have finally done it . Octobot is the world's first soft robot . It is not like the scary , meta...
【判断题】Spoken material is often heard many times in most cases like written material.
A.
正确
B.
错误
【判断题】Paving meansa surface of flat stones or material like stone on the ground, which is only used in urban space.
A.
正确
B.
错误
【简答题】乙数是甲数的20%,是把( )看作单位“1”。
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