问题
问答题 简答题
简要阐述强化木地板的结构及各结构层的功能。
答案
参考答案：
强化木地板主要由耐磨层——装饰层——芯层——防潮层构成。耐磨层主要是保护地板表面、装饰层主要是美化装饰地板、芯层提高地板质量、防潮层防止地板受潮导致地板翘曲、膨胀。
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简要阐述强化木地板的结构及各结构层的功能。
参考答案：
强化木地板主要由耐磨层——装饰层——芯层——防潮层构成。耐磨层主要是保护地板表面、装饰层主要是美化装饰地板、芯层提高地板质量、防潮层防止地板受潮导致地板翘曲、膨胀。
In many people’s eyes, middle school students are happy and carefree（无忧无虑）. But is it the truth? And what students happy or unhappy? To find out the answers, Li Jiahui, a student in Pinggu No. 3 Middle School, Beijing, spent six months students’ sense(感受) of happiness last year. The girl made a survey with questions such as “ Are you feeling happy?” and “What makes you unhappy?” After studying the answers from 284 students, Li learned that___ 40 percent（百分之）of the students feel unhappy, and the from studies is the main reason for their unhappiness. “More than 50 percent said they were under pressure and 70 percent get enough sleep,” Li said. “It shows that middle school students are not as happy people think. They worry a lot, and they can get angry easily.” Li also said that over 90 percent say their happiness has to do with how much money they have. Instead, they care about their relationships（关系）with friends, teachers and parents. “Students always feel better when they get _ well with each other,” Li said. After her survey, Li listed tips that may make students happier, such as: Treat(对待) yourself better, be kind and polite to your friends and relatives, and try new things.
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