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Complete the sentences with words from Exercise A. You can change the form if necessary.barelyfortunehesitatehighwaymileagepracticalreliablesecond-handstickerSUV7. Sophie’s notebook is covered with _________.

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Complete the sentences with words from Exercise A. You can change the form if necessary.barelyfortunehesitatehighwaymileagepracticalreliablesecond-handstickerSUV8. There are various _________ problems that we need to overcome.

电荷的__移动形成电流，电流的实际方向为运动的方向。

电路的三种状态为断路、、。

电阻R1为6Ω，R2为3Ω，两个电阻串联后的总电阻为Ω，两个电阻并联后的总电阻为Ω。