以实干出政绩,迎难而上方显本色担当。
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最令航天业担忧的是钇供应紧张。钇是高温防护涂层中的关键成分,可防止发动机和涡轮在高温下“熔化”,一旦无法定期施涂相关涂层,发动机便无法正常服役。
Apollo 8 was Nasa's most dangerous mission yet
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