Its vertices are located at all points of the form ( i1 , i2 ) or each vertex has six neighbors . the six neighbors of the vertex v are the set of vertices the set of edges e the model of the hexagonal lattice the usual way to imbed the hexagonal lattice is such that its face are regular hexagons . the vertices are the points . the origin is in the center of one of the hexagons and the periods are ( , 0 ) and ( 0 , 3 ) 顶点集合为为整数边的集合为相邻}正六边形点格模型为：平面是由正六边形点格组成，它的顶点坐标为其中，原点在一个正六边形的中心，周期为( 3 ~ ( 1 / 2 ) ， 0 )和( 0 ， 3 )我们可以把它在竖直方向压缩1 3 ~ ( 1 / 2 )倍使它成为周期图。
This procedure can imitate the single well pumps water the chronometer calculates at all point water level in district declines deep with horary variety ; study the sport law of the rivers ; solve definitely flow draw water issue wanton boundary the wells of termses , predict that dives under water in the location , guide and construct and excavate the progress , appraise the rationality of the precipitation scheme 此程序可以模拟单井抽水时计算区域各点水位降深随时间的变化，研究水流运动规律；求解任意边界条件下的井定流量抽水问题，预测潜水位，指导施工开挖进度，评价降水方案的合理性。
This study thoroughly analyzes the farmers " over - burden and the reason of gradual cryptic and complicated at all points , such as macroinstitution system background , the disadvantage of traditional distribution system , the externality of farmers " burden , the cost of farmers " cooperation and objection , the substitutive mechanism of agricultural tax and the collection cost of burden above tax 本研究从宏观制度背景、传统分配体制积弊、农民负担的外部性、农民合作及反对成本、农业税收替代机制、税外负担的征收成本等方面对农民负担过重并日渐隐性化、复杂化的原因进行了深入剖析。
The brief name ring , measures a device right high , inside , low and each segment scope for ability for even emersion of signal , pointing lowestly validity returning putting the frequency with tallestly validity returning put of the frequencying . request towards device rang contain both side , on is a scoping as far as possible breadth , can be namely frequency bottom that replay the is as far as possible low , and the upper limit is as far as possible high ; two is a frequency scope the inside is at all point to respond to as far as possible flat , avoided to appeared the big motion 简称频响，衡量一件器材对高中低各频段信号均匀再现的能力，指最低有效回放频率与最高有效回放频率之间的范围。对器材频响的要求有两方面，一是范围尽量宽，即能够重播的频率下限尽量低，上限尽量高二是频率范围内各点的响应尽量平坦，避免出现过大的波动。
