简述液压泵正常工作必备的条件是什么。
题型：问答题 简答题
问题：
简述液压泵正常工作必备的条件是什么。
题型：问答题 简答题
| 阅读理解。 | ||||
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| 1. Which of the following is needed for Step 2? | ||||
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| A. Ribbons. B. Tape. C. A pencil. D. A string. | ||||
2. After which step will your windsock be like this?  | ||||
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| A. Step 1. B. Step 2. C. Step 3. D. Step 4. | ||||
| 3. Right after you put ribbons through the holes in the tube, you should _____. | ||||
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| A. tie the ribbons firmly B. tape the tube together C. make holes in the tube D. draw pictures on the paper | ||||
| 4. Why does the author write this passage? | ||||
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| A. To tell an interesting story. B. To teach an important lesson. C. To give information about wind. D. To explain how to make a windsock. |
