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层次模型、网状模型和关系模型是根据___________来划分(命名)的。
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__________不是面向对象数据模型中涉及的概念。
Brazilian Zarela Mosquera moved to the United States as a teenager. The adjustment to a new place was1Mosquera says she became a bratty (顽皮的) teenager, as a result. But it was not just the2that affected her behavior. Mosquera says there was another major stress in her life at that time: She was the only member of her3who spoke English.“Being in a country with my family that doesn’t speak Spanish and my parents don’t really speak4, my parents were trying to give me all these responsibilities.” Along with Spanish and English, Mosquera also speaks Portuguese. But there was another universal language she learned to love as a child: art.Zarela Mosquera connected with drawing and painting while in school.5she mostly dismissed art as a path to a career. She says her Dad6always say, “Think about the7.” Mosquera did not think he would support the study of8.once she went to college.But, to her9, it was her parents who suggested just that. They urged her to10to technical and liberal arts schools. “One of them was Rhode Island School of Design, which was like my11choice.” RISD, as it is called,12Mosquera as well. She enrolled in industrial design.“It’s basically to design13and services. I could be doing something more technical or something more14to problem solving. Whether it’s15out a better way to filter water or developing a type of specific shelter16refugees for example.”Mosquera says the course of study was17including metal working, woodworking and model making. She says in one class she just drew cubes for an entire month, which led her to a18: “Wow! Do I really want to do this?” But, she says, she19the cube study. And, then she began20on more interesting projects.Mosquera is now a design strategist for Marshall Moya Design, an architecture and interior design company in Washington, D. C.
My close childhood friend spent the last eight years attending night school to get his bachelor's degree while working a full-time job. Last month, after1 of late nights and weekends of2course work and studying, he finally3.He remained in our hometown after4school, but most of his friends, myself included, left our5 long ago to other states for university and employment. Over time, newfound responsibilities, families, and other engagements have made it6that we're back in our hometown at the sametime.One of our mutual friends7a wonderful idea of kindness: plan a weekend that we’d all be8 to fly back to our hometown to9 him and celebrate hisaccomplishment.It was so much fun10 the behind-the-scenes! The bait: His mom told 11that he was going to have 12 with just his grandparents to celebrate. Little did he 13that the dinner would turn into a 20-person 14with friends present from both coasts! I got to order this non-dairy cake15everyone attending could enjoy it. I asked his mom for tips 16a flavor he wouldlike.17 the guest of honor arrived to “dinner with the 18”, was thoroughly surprised and toldushowmuch 19 meant to himethatweallflewintomakehimfeel sepecial, the kindness mission（重要任务）was 20.
由变容二极管构成振荡器，主要是利用二极管的 。
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