【单选题】【消耗次数：1】
Once a picture is proved to be a forgery, it becomes quite ___.
①
invaluable
②
priceless
③
worthless
④
valuable
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随机题目
【多选题】
运用专家意见法进行市场调查，通常是基以以下原因
①
缺乏历史资料
②
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企业为了节省预测费用
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既要有量化分析，有要有质的分析