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FCFS调度只适合进程调度
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产生死锁的根本原因是竞争资源
中国有明确文献记载的历史大概就是4500年左右。（）
W: Good morning. May I help you?M: Hi. We'd like two tickets to __1____, please.W: Suzhou. Certainly. Traveling today?M: Yes.W: The next __2___ is at 12:25. Will that be OK?M: I'll __3___ the 12:25 tickets.W: Single or return?M: Two ___4___. How much are the tickets?W: First __5___ is 100 yuan and second class is 80 yuan.M: Two __6___ class is fine, thank you.W: That's __7___ yuan, please.M: Here's the money.W: And here are your tickets. Have a nice trip.
35KV及以下、输电距离几十公里以内的电力网，称为__________。
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