舱外航天服实际上是最小的载人航天器，是航天员走出航天器到舱外作业时必须穿戴的防护装备如图27所示．舱外航天服质量仅约110kg，除了具有舱内航天服所有的功能外，还增加了防辐射、隔热、防微陨石、防紫外线等功能．舱外航天服主要由外套、气密限制层、液冷通风服、头盔、手套、靴子和背包装置等组成，是一种多层次、多功能的个人防护装备．气密限制层是舱外航天服最重要的部分，它的作用是保持服装气密，限制服装膨胀，使各大关节具有一定的活动度．液冷通风服穿在气密限制层内，在服装的躯干和四肢部位有网状分布的塑料细管，液体流过时可将热量带走．

    Hi! Welcome to my webpage. My name's Tom Wood and I'm an English teacher. I ____ (design) this webpage last week so that my students can learn more about me. I think it is important____ (know) my students well. And it is only fair____ my students know me well, too.

    I was born in London, England, but I've lived and worked in China for the past 15 years and I really like living here.

    I can speak Putonghua and even a little bit of Cantonese____ is my wife's dialect (方言). I practice____(speak) Chinese every day and I am improving____(fortunate), there are one or two million people in my town who are ready to help me with my Chinese! I particularly enjoy talking to my neighbors.

    My favourite sport is football. I play football once a week with some of the other teachers at the school. We're going to organize a(n)____ (compete) with teams of teachers from other schools this summer.

    My other great love is my motorbike. I love getting on my motorbike and riding out to the countryside. But my wife thinks it's too____ (noise )and dangerous. If anyone wants to send me an email, just____do) as you like. I'd love to hear____ you.

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