Paul Ray said they discovered that a clear cultural change was happening in many areas EXCEPT______.
A. people"s lives
B. environmental issues
C. consumption patterns
D. media advertisements
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The contradiction that arose at the Constitutional Conference of 1787 was contradiction between______.
A. big states and small states
B. industrial-commercial interests and landed interests
C. one house or two houses for Congress
D. both A and B
4M3电铲中心轴的作用是使转台对机座起到定心与连接作用。()
不论简单还是复杂的液压系统基本上都由二部分组成。()
根据轨道杂化理论，烯烃的双键是由下列哪种轨道杂化而成的
A. sp
B. Sp2
C. sp3
D. d
E. spd
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