问题
问答题 简答题
用落球法测定液体的粘度实验中，标志线N1可否与液面对齐？为什么？
答案
参考答案：因为当标志线N1与液面对齐时，小球刚下落时不是匀速直线运动，是作加速运动，使得测出的速度不准，从而使粘度系数η值的测量值不准。
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用落球法测定液体的粘度实验中，标志线N1可否与液面对齐？为什么？
参考答案：因为当标志线N1与液面对齐时，小球刚下落时不是匀速直线运动，是作加速运动，使得测出的速度不准，从而使粘度系数η值的测量值不准。
| 阅读理解。 | |
| Welcome to my home. Look, this is my father. He is sitting on the sofa and watching TV. He likes sport programs best. Yao Ming is his favorite sport star. The old man and old woman are my grandparents. They are sitting on the chairs near the window. They are drinking tea and chatting (闲谈) happily. The woman with long hair is my mother. She is cooking dinner for us in the kitchen. It's her favorite job at home. She can cook much delicious food by h | |
Who | What is/are doing? |
I | 1 |
2 | playing computer games |
grandparents | 3 |
my father | 4 |
my mother | 5 |