20世纪40年代至60年代是传播效果研究的第二阶段。这个阶段提出的关于传播效果的观点是
A.“皮下注射论”
B.“培养理论”
C.“有限效果论”
D.“知识沟理论”
正确答案是C
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Modern physicists still look mostly at things we can't see. Either very small things in quantum physics or very big things like galaxies. Puting them together is the main problem of modem physics. The universe of space and time described by Einste