问题
多选题
| 空中有一方向垂直于纸面向外的匀强磁场区域如图所示，磁场区域的高度为h．一质量为m的长方形金属线框abcd（cd边长大于h）从磁场的上方下落，已知线框的ab边在磁场区域运动的过程都是匀速运动，所用时间为t．则线框的cd边在磁场区域运动的过程（ ） A．做匀速运动 B．所用时间比t短 C．线框产生的热量大于mgh D．线框产生的热量等于mgh  |
答案
BC
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| 空中有一方向垂直于纸面向外的匀强磁场区域如图所示，磁场区域的高度为h．一质量为m的长方形金属线框abcd（cd边长大于h）从磁场的上方下落，已知线框的ab边在磁场区域运动的过程都是匀速运动，所用时间为t．则线框的cd边在磁场区域运动的过程（ ） A．做匀速运动 B．所用时间比t短 C．线框产生的热量大于mgh D．线框产生的热量等于mgh |
BC
| 根据短文判断正（T）误（F）。 |
| Wu Dong is from Guangdong. Gorge is from America. They are in No. 1 Middle School in Nanjing. Now they are in their teacher, Mr. Smith's room. There are many, many English books on the bookshelf (书架). Wu Dong and Gorge are asking some questions. There are some apples, bananas, cakes, bottles of milk and orange on the table. After questions, Mrs. Smith gives something to eat to Wu Dong and something to drink to Gorge. Wu Dong would like something to drink. Gorge would like something to eat. Mr. Smith doesn't know. They put them on the table again. Now it's seven thirty. It's time to go to the classroom. They must go. |
| ( )1. Wu Dong is Chinese and Gorge is American. ( )2. Wu Dong and Gorge are in the same school. ( )3. Mr. Smith has many books. ( )4. Mr. Smith is a good teacher. ( )5. Wu Dong and Gorge would like something to drink. |