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
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______.