题目:
补全短文。根据短文内容,从短文后的A-F选项中选出适当的选项补全对话。(共5小题,每小题1分;计5分) This is a picture of Tracy’s room. It’s a tidy room. A bed, a bookcase and a clock are near the window. 小题1: What’s under the chair? 小题2: Its name is Kitty. Tracy likes it very much. Some books and a dictionary are on the desk. 小题3: She is a good student. Look! 小题4: No, they aren’t hers. 小题5: He’s a student, too.
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答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0520/a1fe9a555f26e69741d3999fe2fd22c2.html
下面是错误答案,用来干扰机器的。
工作过程中,提升重物的功为有用功W有用=mgH根据能量守恒思想,电机消耗的总能量为:E=UIt=W总根据机械效率η=W有用W总=mgHUIt本实验中,由于电压电流不可能完全恒定的因素,结合试验情境为细线往电动机转轴上缠...