pipeline pump

if disable, as use and go on wall concolorous watercolour or besmear of paint of ability in swimming, bilge so won't apparent.

若都无效，不如使用和墙壁同色的水彩或水性油漆涂上去，污垢就不会那么明显了。

The existence of a concolorous rectangle on m × n chessboard dyed by r-color is introduced.

介绍了棋盘构形中m×n棋盘r染色的同色矩形存在性的问题。

Discussion on Concolorous Rectangles of Figure on a Chessboard

关于棋盘构形中同色矩形问题的一些探讨

leaves with petiole 13-20 cm, axis terete, slightly ridged adaxially, concolorous with branches;

正面的叶柄13-20厘米，轴圆柱状，稍具脊，两面同色的具分枝；

Research on the Embedded Control System of Automatic Grating Concolorous Apparatus

自动光栅单色仪嵌入式控制系统的研制