对大型运载火箭的固体助推器，通常采用摆动喷管推力向量控制。
The deflecting nozzle thrust vector control is usually used in a large solid booster.
中国在2 1世纪初必须推出能与世界先进国家相当的大型运载火箭。
In the early part of 21st century, China should successfully develop its heavy lift launch vehicles equivalent to that of other advanced countries in the world.
大型运载火箭迭代制导方法是一种涉及面较广、难度较大的课题，本文对其进行了一定研究。
The iterative guidance method launch vehicle is a synthetical and difficult subject which involves many courses and disciplines. In this paper, some researches are done in this field.
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