质量为m的通电导体棒ab置于倾角为θ的导轨上，如图所示．已知导体与导轨间的动摩擦 发布时间：2017-06-28 22:17 │ 来源：www.tikuol.com 题型：多选题 问题： 质量为m的通电导体棒ab置于倾角为θ的导轨上，如图所示．已知导体与导轨间的动摩擦因数为μ，在图所加各种磁场中，导体均静止，则导体与导轨间摩擦力为零的可能情况是（ ）A．B．C．D．
题型：多选题 工程施工合同计价类型中，( )合同计价方式一般适用于工程规模较小、技术比较简单、工期较短，且核定合同价格时已经具备完整、详细的工程设计文件和必需的施工技术管理条件的工程建设项目。A．固定总价 B．固定单价C．可调价格 D．成本加酬金 查看答案
题型：多选题 从B栏中选出A栏句子的相应答句。A ( )1. What day is today? ( )2. What do you do? ( )3. How many do you have? ( )4. Thank you very much. ( )5. Why is she away? ( )6. Where does he work? ( )7. What's the time? ( )8. Would you like an orange? ( )9. What's wrong with it? ( )10. I'm sorry I can't help you. BA. I have only one. B. No, thanks. C. It's Friday. D. It's about ten to ten. E. It's broken.F. I'm a teacher. G. Because she is ill. H. That's all right. I. It's a pleasure. J. He works in a hospital. 查看答案
