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(2) 在自愿的前提下，邀请观察员观摩空间飞行器发射；
(ii) invitation of observers to launches of spacecraft on a voluntary basis;
Last Update: 2016-12-03
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a．载人空间飞行方案
a. manned space flight programme
Last Update: 2016-12-04
Usage Frequency: 4
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