On the optimum mass ratios of two-stage rocket in the practical permissible region, we get the results analytic expression.
本文考虑二级火箭在实际允许区域内的最佳质量比问题，得到解的解析表达式。
The two-stage rocket, called Korea Space Launch Vehicle I or KSLV-I, blasted off at 5 p.m. into blue skies from the seaside Naro Space Center, near the city of Goheung on the country's south coast.
被称作“韩国航天运载器一号”的两级火箭是周二下午5时从韩国南部海岸高兴郡的罗老宇航中心发射升空的。
The two-stage rocket, called Korea Space Launch Vehicle I or KSLV-I, blasted off at 5 p. m. into blue skies from the seaside Naro Space Center, near the city of Goheung on the country's south coast.
被称作“韩国航天运载器一号”的两级火箭是周二下午5时从韩国南部海岸高兴郡的罗老宇航中心发射升空的。
The rocket consists of a giant core stage flanked by two solid rocket boosters, each slightly larger than the first stage of Ares I.
火箭有一个巨大的核心，两侧是两个固体火箭助推器，每个比战神i的第一级稍微大一些。
The first stage of the two-stage Naro rocket was designed and built by Russia and the second by South Korea.
“罗老”号二级火箭的第一级由俄罗斯设计并建造，第二级由韩国负责。
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.
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。
NASA plans to use a five-segment shuttle booster as the first stage of its Ares I rocket, one of two being designed as part of the post-shuttle Constellation program.
NASA计划用五级航天飞机助推火箭作为Ares I火箭的第一级，Ares i是淘汰航天飞机后的星座计划使用的两种火箭之一。
It's a two stage, 15 ton, solid fuel rocket that could instead carry a half ton penetrating, high-explosive warhead, along with the special guidance system (a radar and image recognition system).
它是一种二级、重量15吨固体燃料推进火箭可以改为携带一枚重量半吨的侵彻、高爆弹头，连同专用制导系统一起(一套雷达和图像识别系统)。
One foreign rocket engineer calculates that the Long March 7 would need two of the 18-ton engines for its second stage.
一位外国火箭工程师的计算，长征7条将需要其第二阶段的18吨重的两个引擎。
Viewers who were able to watch the launch on television could see the lift-off from the perspective of Odyssey's Delta II rocket, which had two video cameras attached to its 2nd stage.
能够在电视上观看发射情况的观众可以看到奥德赛从德尔塔II火箭发射升空的远景。火箭的第二级上安装了两台报像机。
Two-and-one-half minutes after the Apollo Eleven launch, the first-stage rocket separated from the spacecraft.
阿波罗11发射两分半钟后，第一级火箭从宇宙飞船中分离出来。
Two-and-one-half minutes after the Apollo Eleven launch, the first-stage rocket separated from the spacecraft.
阿波罗11发射两分半钟后，第一级火箭从宇宙飞船中分离出来。
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