• Before the collision, Iridium had a group of sixty-six satellites in orbit.

    VOA: special.2009.04.01

  • If the vehicle in the unfortunate circumstances of a collision, has to be able to maintain the security of the hydrogen which means more mass, which means a lot of the efficiency is being squandered What's the environmental impact of hydrogen production?

    如果车辆,在碰撞中发生了不幸,要仍然能够保持氢气的安全性的话,意味着需要更多的质量,也就是说大部分效率被浪费了,制氢对环境有什么影响呢?

    麻省理工公开课 - 固态化学导论课程节选

  • If the vehicle in the unfortunate circumstances of a collision, has to be able to maintain the security of the hydrogen which means more mass, which means a lot of the efficiency is being squandered What's the environmental impact of hydrogen production?

    如果车辆,在碰撞中发生了不幸,要仍然能够保持氢气的安全性的话,意味着需要更多的质量,也就是说大部分效率被浪费了,制氢对环境有什么影响呢?

    麻省理工公开课 - 固态化学导论课程节选

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