硒光电管

Paul Nipkow obtains a patent in Germany for TV, using a selenium cell and a mechanical scanning disk.

保罗·尼普可夫获得德国电视发明专利。他在电视技术中采用硒光电管和机械扫描盘。

Its electrical conductivity increases when light strikes it, and it can convert light directly into electricity, so selenium is used in photocells (e.g., in light meters and security alarms), solar cells, and photocopier s.

当受到光照时，它的电导率增加，可以将光直接转换成电，所以硒被用于光电管、太阳电池以及测光计。

Its electrical conductivity increases when light strikes it, and it can convert light directly into electricity, so selenium is used in photocells (e.g., in light meters and security alarms), solar cells, and photocopiers.

当受到光照时，它的电导率增加，可以将光直接转换成电，所以硒被用于光电管、太阳电池以及测光计。

Its electrical conductivity increases when light strikes it, and it can convert light directly into electricity, so selenium is used in photocells (e.g., in light meters and security alarm s), solar cells, and photocopiers.

当受到光照时，它的电导率增加，可以将光直接转换成电，所以硒被用于光电管、太阳电池以及测光计。

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。