feed main वाक्य

According to the types , height and fireproof grade of the buildings , four basic ringed arrangements are brought up , namely the ringed arrangemensts of branch lines , the ringed arrangements of cross mains , the ringed arrangements of feed mains and the ringed arrangements of fire waterhead . on the basis of analyzing the means , characteristic and applicability of the four basic ringed arrangements , several practicality ringed arrangements are brought up , namely the ringed arrangements of branch lines and cross mains , the ringed arrangements of cross mains and feed mains , the ringed arrangements of branch lines and feed mains , the vertical ringed arrangements of feed mains and the ringed arrangements of sprinkler system in the abnormity buildings