问题
问答题
节流调速回路有哪几种类型
答案
参考答案：节流调速回路有进油路节流，回油路节流，旁油路节流三种。
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节流调速回路有哪几种类型
参考答案：节流调速回路有进油路节流，回油路节流，旁油路节流三种。
| 阅读理解。 | |
| Have you ever rubbed your hands together when they get cold? Why do we do that? We do that for friction. Friction happens when two things that aren't very smooth rub together to make heat energy. The faster you rub two things together, the more friction (and heat) you can make. Let's discover friction! | |
| |
| 1. You'd better make your hands ________ to get heat when you rub them. | |
| A. slippery B. dry C. wet D. smooth | |
| 2. What does the word "friction" in this text mean in Chinese? | |
| A. 摩擦 B. 冷却 C. 膨胀 D. 震动 | |
| 3. ________ is NOT an example of friction. | |
| A. Bike riding B. Car driving C. Hands rubbing D. Friction discovering | |
| 4. What's the last column (栏目)? | |
| A. THINK IT OVER! B. WHAT HAPPENED? C. EVERYDAY ACTION: D. WORK WITH PARENTS! | |
| 5. This text is most probably ________. | |
| A. a science report B. a car advertisement C. a rubbing introduction D. a chemistry programme |