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【简答题】
是定义在D上的函数，若存在区间 ，使函数 在 上的值域恰为 ，则称函数 是k型函数．给出下列说法： ① 不可能是k型函数； ②若函数 是1型函数，则 的最大值为 ； ③若函数 是3型函数，则 ； ④设函数 (x≤0)是k型函数，则k的最小值为 ． 其中正确的说法为 ．（填入所有正确说法的序号）
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【单选题】________ refers to socially and environmentally responsible marketing that meets the needs of consumers and businesses while also preserving or enhancing the ability of future generations to meet thei...
A.
Ambush marketing
B.
Evangelism marketing
C.
Sustainable marketing
D.
Database marketing
E.
Affinity marketing
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【多选题】官方微博/微媒体的内容建设包含()
A.
企业的微博必须是官方的
B.
传播的内容也必须是官方的
C.
内容较为正式
D.
可以在第一时间发布企业最新动态
E.
对外展示企业品牌形象
【判断题】Market research is concerned specifically with markets, while marketing research is concerned specifically about marketing processes.
A.
正确
B.
错误
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