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【单选题】
1986年1月28日，美国“挑战者”号航天飞机升空1分钟后，突然爆炸，7名宇航员惨遭罹难，魂撒空间，12亿美元的飞行器顿时成为乌有。这体现了军事高技术的()。
A.
高投资
B.
高风险
C.
高保密
D.
高竞争
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