A.select avg(score)from stu
B.select max(score)from stu
C.select min(score)from stu
D.select sum(score)from stu
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最新試題
防火墻可分為以下()
判斷文件file是否可執(zhí)行,可以用()
iptables中,選項()實現(xiàn)指定默認策略。
有關防火墻的說法正確的是()
iptables的策略有()
在設置iptables規(guī)則時,不指定表時,規(guī)則將保存在filete表中。
ipables是開源的軟件防火墻。
iptables四表中規(guī)則默認存放的表是()
iptables中能實現(xiàn)端口映射的是哪個表()
iptables中的filte表有哪幾個規(guī)則鏈()