Laboratory glassware ; gas inlet tubes 實(shí)驗(yàn)室玻璃儀器.氣體引入管
Glands for cables ; screw bushes 電纜引入管.螺紋套筒
Conduits pipes with sleeve nut and gasket for steel tubes and tubes of copper or copper alloys 鋼管和銅或銅合金管用鎖緊螺母和密封圈的引入管套筒
And they ca n ' t take into account distributing of crops and water requirement and water content of soil . aiming at the limitations of this irrigation system , a expressions about design flow of pipe networks is set up by the probability methods . a model of stochastic non - linear programming by random irrigating is presented to optimize network of micro - irrigation 論文針對這種灌溉制度的缺點(diǎn),引入管網(wǎng)流量設(shè)計(jì)保證率、概率約束等理論,用概率論的方法推求了隨機(jī)灌水條件下管網(wǎng)設(shè)計(jì)流量的計(jì)算公式,并建立了隨機(jī)取水條件下微灌系統(tǒng)管網(wǎng)優(yōu)化設(shè)計(jì)隨機(jī)非線性規(guī)劃數(shù)學(xué)模型。