做系统快照，查看端口信息的方式有
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设二阶可导函数，则（）
设数列收敛，则（）
Hefellasleepimmediatelylastnight;hemust________(be)verytired.
Whenhesuddenly________upthesubjectofgeneticengineering,therewasanembarrassedsilence.
Constructionoftherailwayshelpedtodevelopthenational_______ofTanzaniaandZambia.
