For this part, you are allowed 30 minutes to write a composition on the title Hosting Olympic Games. You should write at least 120 words following the outline given below in Chinese: 1. 有人认为奥运会应该在一个固定的地方举办; 2. 但是,有人认为奥运会应该在不同的地方举办; 3. 我的观点。
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【简答题】设某一电流源的电流为i s =2δ(t)-0.5δ(t-2)+δ(t+1)A,t的单位为秒,试画出其波形。
【单选题】In the A-B-C classification system, items which account for fifteen percent of the total dollar-volume for a majority of the inventory items would be classified as:
【单选题】In the A-B-C classification system, items which account for sixty percent of the total dollar-volume for few inventory items would be classified as: