镜头支架

Item: Hybco Model 1920 Optical comparator with 10 diameter cross line screen with protractor ring and tool makers chart, with vernier scale, 20X lens with positioning compound giving longitudinal and cross adjustment, power supply and brackets for mounting on model 3000 TC.

项目：Hybco Model 1920 光学投影仪。带360度量角器和刀具制作图表的十字线投影屏直径10英寸，带游标尺，可横向，纵向调节的20倍镜头，3000TC用电源与支架。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。