A company's marketing decisions may be questioned by consumer organizations, environmental groups, minority groups, and others. These organizations and groups are also known as ________.
A.
media publics
B.
marketing intermediaries
C.
customers
D.
citizen-action publics
E.
internal publics
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【简答题】①存在 使 ②存在区间( a , b )使 为减函数而 <0 ③ 在其定义域内为增函数 ④ 既有最大、最小值,又是偶函数 ⑤ 最小正周期为π 以上命题错误的为____________