The pivot row must be selected so that all the other basic variables remain positive.
必须选择枢轴行，以便所有其他基本变量保持正数。
Selected high quality walnut, give you full of positive energy in the afternoon.
颗颗精挑细选优质坚果，给你满满正能量的下午。
Selected high quality walnut, give you full of positive energy in the afternoon.
颗颗精挑细选优质坚果，给你满满正能量的下午。
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