根据标号有向块的指数型生成函数，研究了具有唯一一个割点的标号有向连通图及所有割点都在一个块上的标号有向连通图的计数问题。
The essay has a study on enumeration question labeled oriented connected graphs with only one cut vertices and labeled oriented connected graphs that all of cut vertices are in same block.
在施工中，由于管理不善，造成部分基桩砼标号低于设计标号，并伴随有断桩等现象的工程质量事故。
But bad construction control results in some low concrete grade of foundation piles and some broken piles.
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