1. a letter or statement, usually is the first part of the questionnaire, there may be a covering letter.On the front, along with a thank you by statement usually identifies the purpose to complete the questionnaire. The answer is to use the query's property description. How to answer a question with, for example, the names and addresses of researchers. An important issue is to display a message that the respondents are confident that the information will not be revealed to reply individually, there will be no effect on the respondent, and the respondent's Tribune.
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