chapter2.4

chapter2.4习题2.4.1

Exercise2.4.1(a-g)欢迎指正WhatPCmodelhaveaspeedofatleast3.00?πmodel(σspeed≥3.00(PC))Whichmanufacturesmakelaptopswithaharddiskofatleast100GB?P(maker,model)=σtype=′laptop′(Product)L(model,hd)=σhd≥100(Laptop
zsi386·2020-07-06 14:46
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