题目

—Jackson, I have heard you quarreled with your boss yesterday.— . We were just arguing with each other about next year's sales plans. A . No problem. B . It doesn't matter. C . It's none of your business. D . That's not the case. 答案：D在“5.12汶川地震”抢险救灾前线，一辆柳州市生产的装载机5s内将一块重20000N的巨石匀速举高3m，装载机的举力对巨石做功为________J，举力做功的功率为________W．