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地理信息系统具有哪几个方面的特征？

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Read and complete the sentences by choosing the appropriate choices(A-H).1. Monday is a＿＿＿＿for Jamaicans—Labor Day, but no one is happy.2. The system is＿＿＿＿but it needs some fine-tuning.3. Colin＿＿＿＿his hand and laid it on his father's arm.4. The following day she felt sufficiently well to＿＿＿＿.5. We hardly know＿＿＿＿.6. This shop has＿＿＿＿hats and shoes.7. ＿＿＿＿people interviewed prefer TV to radio8. There isn't much in＿＿＿＿entertainment in this place.A. public holidayB. go to workC. set upD. each otherE. put outF. the majority ofG. the way ofH. a large choice of

栅格结构建立途径有（）A手工获取B扫描仪扫描、C矢量数据转换而来、D CAM、E CAD,

A. 手工获取
B. 扫描仪扫描
C. 矢量数据转换而来
D. CAM
E.CAD

在栅格结构中，地表被分成相互邻接、规则排列的什么块组成，每个地块与一个栅格单元相对应。

A. 矩形方块
B. 三角形
C. 菱形
D. 六边形