产品生命周期( Product life cycle , PLC ),是产品的 ,即一种新产品从开始进入市场到被市场淘汰的整个过程。
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【单选题】In the sentence 'Because humans are at the top of the food chain, they are particularly vulnerable to the effects of nondegradable pollutants.', 'vulnerable' probably means ______.
【简答题】听下面一段材料,回答第1-3题。 1. Where will Mr. Black stay after his arrival? A. At a hotel. B. At the man's house. C. At the woman's house. 2. What will take place that evening? A. Mr. Black's arrival. B. A hotel...