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设有4个作业同时到达，每个作业执行时间均为2h，它们在一台处理器上按单道方式运行，则平均周转时间为（ ）
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After reading Text B, finish the following multiple choices.Choose the best answer to each of the following.How many people does the author say have tried stepping out of their comfort zone?
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When you step out of the comfort zone, it means________.
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