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第7级题目问答进度	1/1000	花费时间： --分--秒
总数： 0 正确： 0 错误： 0
a name or a symbol which is put on a product to show that it is made by a particular producer and which cannot be legally used by any other producer
A trademark√ (正确答案是：A) B malignant√ (正确答案是：B) C antenna√ (正确答案是：C) D tug√ (正确答案是：D)

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