“这次军营体验让我深刻感受到了军人的不易和伟大！”九江学院艺术学院A2461班罗帅豪在参加完学校组织的军营体验日活动后激动地表示。近日 ...

Two American firms have conducted successful flight tests of a new solid rocket motor with long-range capabilities. RTX and Colorado-based propulsion firm Ursa Major conducted the test at Naval ...