500吨！中国自主研制整体式固体火箭发动机试车成功，有多厉害？|《中国新闻》CCTV中文国际

500吨！中国自主研制整体式固体火箭发动机试车成功，有多厉害？|《中国新闻》CCTV中文国际

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500吨！中国自主研制整体式固体火箭发动机试车成功，有多厉害？|《中国新闻》CCTV中文国际 1:49
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