问题
填空题
设N为两摩擦轮接触面间的法向压力，f为轮面的摩擦系数，F为从动轮的工作圆周力；若fN小于F，（）就带不动（）回转，而导致（）。
答案
参考答案：主动轮；从动轮；打滑
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设N为两摩擦轮接触面间的法向压力，f为轮面的摩擦系数，F为从动轮的工作圆周力；若fN小于F，（）就带不动（）回转，而导致（）。
参考答案：主动轮；从动轮；打滑
| 阅读短文，根据短文内容，选择最佳答案。 |
| My name is Chen Lan. My home is in Gulangyu. Do you know Gulangyu? It is in Xiamen. It is near the sea. Gulangyu is a small place, but it is very nice and clean. There are no cars, no buses, and no bikes. People only walk. So it isn't very noisy. Our house is in the middle of Gulangyu. Behind our house there is a big old tree. My grandfather tells me that the tree is very, very old. There are many birds in the tree. We call it "bird tree". Our house is near the sea. The sea is big and blue. There are a lot of fish in the sea. After school, I go there and catch (捉) fish with my friends. It's very interesting. I like fish and I like catching fish. If (如果) you want to go on a trip. Welcome to Gulangyu. I am going to show you around it. You can have fun here. |
| 1. Chen Lan is from ______. |
[ ] |
| A. Jiangsu B. Fujian C. Hunan D. Beijing |
| 2. What's not in this passage? |
[ ] |
| A. Her house. B. Her friends. C. Her parents. D. Her grandfather |
| 3. In Chinese the word "noisy" means ______. |
[ ] |
| A. 安静的 B. 喧闹的 C. 繁忙的 D. 有意思的 |
| 4. What does the writer like to do? |
[ ] |
| A. catch fish B. catch birds C. go on a trip D. swim in the sea |
| 5. — Is Gulangyu a good place to travel? — ______. |
[ ] |
| A. Yes, it is. B. No, it isn't C. The writer doesn't tell. D.I don't know. |