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,尽可能提供"电话"或类似的设备,让被访者应员的真实性.
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,尽可能提供"电话"或类似的设备,让被访者应员的真实性.
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