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【多选题】
空间数据库与一般数据库相比,具有以下特点()A.
数据量特别大
B.
有属性数据，还有空间数据
C.
数据应用广泛
D.
数据结构简单
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【简答题】When the Mission started it was on ______.
【单选题】Which of the following is true of company mission statements?
A.
Mission statements should be defined in terms of satisfying customer needs.
B.
A firm's mission statement should be product-oriented, focusing on the products the company sells.
C.
Mission statements should not be specific, as this reduces the company's potential for growth.
D.
A company mission statement should be directed at the company's publics rather than at its employees.
【多选题】Which of the statements about the differences between a mission and a vision is true? a mission is something to be accomplished whereas a vision is something to be pursued for that accomplishment.
A.
The mission is the cause and the vision is the effect.
B.
The vision is the cause and the mission is the effect.
C.
A mission is something to be accomplished whereas a vision is something to be pursued for that accomplishment.
D.
A vision is something to be accomplished whereas a mission is something to be pursued for that accomplishment.
【简答题】气相色谱的浓度型检测器有 , ;质量型检测器有 , ;其中 TCD 使用 气体时灵敏度较高; FID 对 的测定灵敏度较高; ECD 只对 有响应;之所以有浓度型和质量型检测器的区别,主要是由于 。
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