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市场细分的概念是美国市场营销学家（）提出的。A、迈克尔·波特B、麦卡西C、菲利普·科特勒D、温德尔·斯密

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多项选择题智能教学环境中常用的信息化教学设备有( ) A、智能黑板 B、智能触控桌 C、黑板+粉笔 D、计算机+投影+幕布

单项选择题Which of the following measures is inappropriate for the safety nursing of patients with senile dementia?

A．Avoid home moving as much as possible
B．Put a sign on the clothes of the patients
C．Do not let the patients do housework on their own
D．Perssuade the patients if possible from the unwillingness to cooperate with the treatment and nursing