如何保持我們的城市清潔建立合作夥伴關係

如何保持我們的城市. 我們是穆斯林,我們應該遵循伊斯蘭教義. 伊斯蘭教為我們提供純度cleanliness.We的意義,因此應該在行動和思想乾淨. 我們的先知 (願他安息) 愛清潔, 我們應該感到跟隨他的腳步而自豪. In Advanced countries even today people dust their houses and its surroundings themselves.In the evening the sprinkle water on the roads in front their houses. These things may be a cause of an epidemic 閱讀更多 [...]

同系列和同系列的特點

Homologous series and characteristics of homologous series Definition; Series of organic compounds which have a same functional group, similar structural feature but differ from each other by an integer number of CH2(methylene group) is called "Homologous series". The number of homologous series differs by molecular mass 14. Characteristics of Homologous series: All numbers of homologous series have similar structures. Physical properties of homologous series change progressively 閱讀更多 [...]