单项选择题

电渗析法制卤能耗和离子交换膜等材料的费用较高，海盐生产成本高（）。

A．对
B．错

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多项选择题

Objective establishment is both important and necessary because _____.
A、it lays foundation for the content and organization of the presentation
B、it helps steer the audience towards destination the presenter wants them to reach
C、the more time the presenter spends on it, the fewer efforts the presenter needs to make in audience analysis
D、it is to a presentation what a map is to a long journey
E、it is the most time-consuming step in preparation processes 无解析

单项选择题

库珀的行政伦理理论是要“阐明行政官员的伦理处境，并培养人们对这个问题进行富有想象力的思考”。

A.正确
B.错误