Choose the right word in their proper form to fill the blank. rub; scratch; scrape Rainsford saw the general his shoulder. He was injured, but he remained standing.
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举一反三
【单选题】在如图所示电路中,已知:U S =9V,I S =6mA,当电压源U S 单独作用时,通过R L 的电流是1mA,那么当电流源I S 单独作用时,通过电阻R L 的电流I L 是()。