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The questionnaire was used to collect the information need to study in a t II. According to this method, a questionnaire is good to save cost, time and resources. One of the more important is to ensure that the computer name n answer, don't need to do face-to-face investigation. However, the study of human, if using this method will encounter various obstacles, such as degree of education and knowledge of the answer to use these terms in the questionnaire is not know. The control rate is then coupled to get the answer that is quite low.
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