extra-low permeable特低渗透率
extra-low ferrochromium法微碳铬铁
extra-low voltage特低电压;安全特低电压;超低压;弱电工程
Extra-low Dispersion超低色散镜片;低色散玻璃;超低弥散现象
extra-low permeability特低渗透率
extra-low interstitial超低间隙
extra-low carbon超低碳
extra-low formaldehyde超低甲醛
safety extra-low voltage安全特低电压;电压;安全特地电压;安全电压