短語(yǔ)詞組短語(yǔ)smokeless XLDB propellant 無(wú)菸交聯(lián)改性雙基推進(jìn)劑smokeless NEPE propellant 微菸NEPE推進(jìn)劑smokeless modified double -base propellant 無(wú)菸改性雙基推進(jìn)劑 返回 smokeless propellant