第三章We can make distinction between primary, secondary, and tertiary sources according to the way of publication（ ）。
答案:错
In the field of history, letters, diaries, objects, maps, and clothing are primary sources.（ ）。 What are the two criteria of evaluating sources（ ）。 Which are search operators in doing online search?（ ）。 The classifications of primary, secondary, and tertiary are not absolute but relative to a researcher’s project.（ ）
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