王大娘家去年收大豆38吨，比收的玉米少14吨．王大娘去年收大豆和玉米共多少吨？ 发布时间：2017-06-02 23:36 │ 来源：www.tikuol.com 题型：解答题 问题： 王大娘家去年收大豆38吨，比收的玉米少14吨．王大娘去年收大豆和玉米共多少吨？
题型：解答题 补全对话。A: Could I speak to Susan, please?B: Speaking, please. A: This is Paul. 1 B: Fine, thank you. 2 A: I'm in London. I'm at my aunt's home. B: Oh, what's the weather like there? A: It's terrible. 3 B: What are you doing now? A: 4 How's the weather in Taiyuan? B: It's sunny. I'm playing baseball with Jeff.A: Jeff? Your pen pal from Shanghai? B: Yeah! He comes to see me today. A: 5 B: Thank you. A. It's windy and cold. B. I hope you have a good time. C. Where is he from? D. How are you? E. How's it going? F. Where are you, Paul? G. I'm playing chess with my aunt. 查看答案
题型：解答题 在某建筑工地上，用电动吊车将水泥板吊上房顶．电动机铭牌上标有“220V，2KW”字样，电动机线圈的电阻为4.84Ω．电动机正常工作25s将质量为240kg的水泥板匀速提升10m高（取g=10N/kg）．①这段时间内，拉力对水泥板做多少功？②这段时间内，电动机消耗多少电能？电流通过电动机线圈产生的热量为多少？③求整个电动吊车的机械效率． 查看答案