Cao

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Cao

1.K2CO3、CaO双磺防塌钻井液抗温可达（）。2.K2CO3、CaO双磺防塌钻井液（）。3.Guan Yu accepted one gift from Cao Cao, which is a sword.4.Zhuge Liang “borrowed” arrows from Cao Cao with boats and archers.5.Cao Cao thought he was the only hero in the three kingdoms period.