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假想用剖切面剖开机件,将处在观察者和剖切面之间的部分移开,而将剩余部分向投影面投射所得的图形,称为 。
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【简答题】阅读短文，选择合适的答案。 It's Sports Day today. The students are all in the playground. Some of them are having matches(比赛). Some of them are watching. Look, Helen and Yang Ling are running. Helen is running fas...
【简答题】某铅酸蓄电池型号为6—QAW—65D,其标准电压为 V.
【简答题】嫉妒心的产生往往是由于独占欲望而产生的。 （）
【简答题】句型转换 1. Linda jumps higher than Tina. Tina didn't jump _ _ Linda. 2. The work is not difficult to do. difficult to do the work. 3. Johnson did well and Mike did well, too. Johnson did Mike. 4. Chen Me...
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