anesthesia

An EPQ Model with Back-orders and Lost Sales;

一种考虑延期交货及失去销售的库存模型

From this love and lost sad story, Sheng Congwen expresses his compassion for the endless cycle of human beings.

这是一个爱与失去的永恒悲剧,从中折射出沈从文对人类在爱与失去中无尽循环的悲悯情怀。