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,尽可能提
"
电话"或类似
设备,让
访者应查到研究人员真实性.
；回答问题
人；（尤指）调查对象；响应；【法】；〈古〉符合;;人,原;;估定之人;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,尽可能提"电话"或类似设备,让访者应查到研究人员真实性.
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