Multiple optimal solutions to the linear programming problem by the simplex method for specific feasible regions sometimes might lead to a loss of efficiency.

用单纯形法求解线性规划问题的多最优解，对一类特殊的可行域，有时会导致失效。

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Lead in linear incandescent lamps with silicate coated tubes.

白炽灯管（硅酸盐涂于灯管）所含的铅。

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Linear exhibition spaces lead visitors from outside to sunken entrance patio, from exhibition hall to exit without any letup.

展厅布局的特点是以线性空间引导观众的流线，由地面下沉到入口庭院，再由出口上升到地面，展线一气呵成，流畅紧凑。

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