本文研究了边覆盖临界图的一些性质。
In this paper some properties of edge covered critical graphs are discussed.
海岸边覆盖着一层贝壳。
水的颜色是黑色，两边覆盖有植被的土地也是深色的。
The water is black, and vegetated land on either side is also dark-colored.
另一较大的标本是这个给人深刻印象的铜明矾--蓝铜矿上边覆盖一层浅蓝色。
Another larger piece was this impressive chalcoalumite from bisbee-the light blue coating on azurite.
引进了拟块有向边覆盖对角占优矩阵概念，给出了新的矩阵非奇异判定定理和特征值分布定理。
We introduced the concept of block directed edge cover diagonal quasi dominant matrix, obtained a new nonsingularity criteria for matrices and distribution theorem on eigenvalues of matrix.
引进了拟块有向边覆盖对角占优矩阵概念，给出了新的矩阵非奇异判定定理和特征值分布定理。
We introduced the concept of block directed edge cover diagonal quasi dominant matrix, obtained a new nonsingularity criteria for matrices and distribution theorem on eigenvalues of matrix.
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