介绍了某型号运载火箭二级燃料箱后底顶盖成形方法改进及工艺试验过程。
The paper introduces the shaping method improvement and technological trial course of bottom cap of certain model of carrier rocket's fuel tank.
韩国教育、科学和技术部长安秉万称，“罗老”号二级火箭在自太空中心发射前后运作正常。
The two-stage Naro rocket operated normally during and after liftoff from the country's space center, Minister of Education, Science and Technology Ahn Byong-man said.
火箭又长又细，上部有点粗，因为它的第二级比固体燃料火箭发动机驱动的第一级要厚。
The rocket is long and slender, and fatter on top because its second stage is thicker than its solid rocket motor-powered first stage.
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