问题
填空题
内燃机的一个工作循环的四个冲程，图中表示的是其中的_________冲程；它将______能转化成_______能。
答案
做功；内；机械
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内燃机的一个工作循环的四个冲程，图中表示的是其中的_________冲程；它将______能转化成_______能。
做功；内；机械
| 根据句意从方框中选用合适的词语，并用其适当形式填空。 | |
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| 1. He _______ his bedroom. It's clean now. 2. The boy _______ seeing his mother now. He misses her very much. 3. They are interested in _______ on the Net, for it can make them know each other well. 4. I must _______. I'm meeting Brand at half past seven. 5. I write to my mother every week, _______ on Sundays. |