问题
选择题
| So far this year we _____ a fall in house prices by between 5 percent and 10 percent. |
A. saw B. see C. had seen D. have seen |
答案
答案：D
搜题请搜索小程序“爱下问搜题”
| So far this year we _____ a fall in house prices by between 5 percent and 10 percent. |
A. saw B. see C. had seen D. have seen |
答案：D
某固态物体加热后成了液态，随后停止加热让它冷却，并记录记录与时间的变化关系如下表，由于疏忽，有一个温度值读错了，请你分析实验数据并回答：
| 时间（min） | 0 | 2 | 4 | 6 | 8 | 10 | 12 | 14 | 16 | 18 | 20 | 22 |
| 温度（0C） | 98 | 91 | 85 | 80 | 79 | 69 | 79 | 75 | 71 | 67 | 64 | 61 |
（2）该物质______晶体（填“是”或“不是”），其理由是______．
（3）写出一条新的发现______．