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【单选题】
下列关于压电效应和压电材料的描述，正确的是（ ）A.
在压电晶片上施加机械压力其表面可产生电荷，这种现象为逆压电效应
B.
在压电晶片上施加交变电信号可产生晶片的机械振动，这种现象为正压电效应
C.
压电材料的厚度与超声响应频率无关
D.
压电材料一般需要磁场极化处理
E.
与高频率超声探头相比，低频率超声探头采用较薄的压电材料
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【简答题】听力原文：The rise of multinational corporations, global marketing, new communications technologies, and shrinking cultural differences have led to an unparalleled global development in public relations or...
【单选题】He gave his ______ for new marketing procedures.
A.
representations
B.
presentations
C.
comments
D.
memoranda
【单选题】The rise of multinational corporations, global marketing, new communications technologies, and shrinking cultural differences have led to an unparalleled increase in global public relations or PR. Sur...
A.
shrinking cultural differences and new communication technologies
B.
increased efforts of other countries in public relations
C.
an unparalleled increase in the number of public relations companies
D.
the decreasing number of multinational corporations technologies
【单选题】Which of the following is 对 of consumers in the new marketing communications model?
A.
They are more reliant on traditional methods of marketing for product information.
B.
They are less informed than before about companies and product marketing techniques.
C.
They are more reliant on mass-media marketing methods for product information.
D.
They are less powerful than before in affecting the way a company markets its products.
E.
They are better equipped to find product and brand information on their own.
【单选题】在工作分析中存在着“只见树木，不见森林”的误区，可以表现为()
A.
工作分析框架与技术缺乏假设系统
B.
工作分析缺乏对流程的衔接与磨合
C.
忽视对工作分析过程的管理与控制
D.
工作分析框架与技术缺乏系统假设
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