Whenever possible "Freephone" or similar facilities should be provided so that Respondents can check the Researcher's bona fides without cost to themselves.
无论何时,尽可"免费电话"或类似设备,让被访者应免费查到研究人员真实性.
Whenever possible "Freephone" or similar facilities should be provided so that Respondents can check the Researcher's bona fides without cost to themselves.
无论何时,尽可"免费电话"或类似设备,让被访者应免费查到研究人员真实性.
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