一枚北约的导弹误将那架飞机击落。The plane was shot down in error by a NATO missile.他的飞机于1967年在北越被击落。His plane was shot down over North Vietnam in 1967.他们声称击落了一枚来犯的导弹。They claimed to have shot down one incoming missile....
它含在一种叫氢气的很轻的气体中.This energy is contained in a very light gas called hydrogen.为了使管道能达到运输氢气的要求,专门的生产流程是必须的.Special production processes are needed to make pipes for carrying hydrogen.介绍了我国 氯碱 行业副产氢气情况,提出了氢气的回收技术及利用方向.By - ...