The effects of TPUE on the mechanical properties, technique properties, combustion and energy properties of nitramine modified double base propellant are studied.是什么意思_The effects of TPUE on the mechanical properties, technique properties, combustion and energy properties of nitramine modified double base propellant are studied.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句