问题
问答题 简答题
什么是流体？流体具有哪些基本性质？
答案
参考答案：
凡能通过管道输送的，并且具有连续流动性的物质，称为流体。流体包括液体、气体和汽体。流体具有流动性、压缩性，能传递外力，具有浮力、粘滞性和胀缩性等基本性质。
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什么是流体？流体具有哪些基本性质？
参考答案：
凡能通过管道输送的，并且具有连续流动性的物质，称为流体。流体包括液体、气体和汽体。流体具有流动性、压缩性，能传递外力，具有浮力、粘滞性和胀缩性等基本性质。
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| By the third year of teaching I'd begun to expect Christmas break more for the school holiday and less for the excitement of the children. I was teaching fourth grade and my students had made me__1__. I just had to get through one of the hardest days of the school year. The morning bell rang. I walked__2__through the cold into the overly heated school building. Twenty two smiling faces__3__me at the school bus stop. I forced myself to __4__ their smiles. Back into the classroom, they__5__, comparing plans for the__6__. I had to remove one student from each arm__7__ I could take a seat at my desk for my morning duties. Before I could find my roll book(点名册) my desk was covered with__8__and gifts followed by a__9__of "Merry Christmas" wishes. "Oh, thank you," I must have 10 a million times. Each gift was truly special to me, except my 11 mood(情绪). It was kind of them to 12 me. After a while, I heard a small nervous 13 say my name. I looked up to see Brandon standing 14 by my desk, holding a small, round gift. "This is for you." "Thank you, Sweetheart." I laid it on my desk with the others."Um, could you 15 it now?" I gently tore at the paper and tape. " 16 ," he said, "it's breakable." Slowly I opened a small, green Christmas tree ornament(装饰物), complete with a hook already 17 . It dawned on me what he had done. Then a nearby student said that he just pulled that off his own tree. I tried to keep my 18 back. Later that day, I sat 19 the ornament in my hands. Was I really so important to this child that he had searched for something to give me? Now every year as I 20 pull a green Christmas ball from my ornament box, I remember the deep influence my students have on me. | ||||
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