问题
问答题 简答题
计算题：试确定图2所示图形的形心C的位置。
答案
参考答案：
把图形看作是由两个矩形a和b组成的，选取坐标系如图所示。每一矩形的面积及形心位置分别为：
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计算题：试确定图2所示图形的形心C的位置。
参考答案：
把图形看作是由两个矩形a和b组成的，选取坐标系如图所示。每一矩形的面积及形心位置分别为：
| 阅读理解。 | ||||||||||||||
下面是Fred 一周的活动安排:
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| 1. Where does Fred meet Ann? | ||||||||||||||
| A. At Brown's house. B. In the hospital. C. At the station. D. At Kay's house. | ||||||||||||||
| 2. For how many hours a week does Fred do his part-time job? | ||||||||||||||
| A. Five hours. B. Six hours. C. Ten hours. D. Eleven hours. | ||||||||||||||
| 3.___________is ill in hospital. | ||||||||||||||
B. Joy C. Tom D. Kay | ||||||||||||||
| 4, Kay's birthday is on ______________. | ||||||||||||||
| A. Tuesday B. Friday C. Sunday D. Thursday | ||||||||||||||
| 5. What does Fred do on Saturday afternoon? | ||||||||||||||
| A. Play football. B. Study with Tom. C. Have a dancing class. D. Do a part-time job. |
多音字组词。
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