题目内容

电阻元件上电流、电压的参考方向不一致，则其伏安关系的表达式应为（）。

A. U=-IR
B. U=IR
C. i=Gu
D. U=I2R

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关于电源、负载和功率的说法中，正确的是（）。

A. 电源和负载都可能吸收功率
B. 电源一定发出功率
C. 负载一定吸收功率
D. 负载一定发出功率

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What would the scientist feel like if he were inside the tube? How does thisexplain the effect of carbon dioxide on the temperature of the atmosphere?

How long does it take for carbon dioxide to spread throughout the Earth’s atmosphere? How long does it take for the gas to be absorbed into the oceans?