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【多选题】
地理信息系统主要由四个部分组成,即()A.
计算机硬件系统
B.
计算机软件系统
C.
地理空间数据
D.
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【简答题】There was once a farmer who lost his watch in his barn ( 仓库 ). The watch was only cheap but it was very ________ to him because it was a present from his father. After ________ the barn for a long tim...
【简答题】糖原合成时活性葡萄糖的形式是 （ ）。
【简答题】何谓机械效率 ?对机械效率的力比形式的计算公式 η = P 0 / P 或η = M 0 / M 应如何 理解 ?
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