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寇国臣同志:熔化镁铜合金时,用普通食监作被覆剂,会增加镁的损耗,因为在普通食盐中含有结晶水,
Comrade Kouguo Chen: melting magnesium copper alloy, with ordinary food supervisor for the coating agent, will increase the loss of magnesium, because in ordinary salt containing water of crystallization,