问题
问答题 简答题
选择比模量高的材料作为航天器结构材料的主要目的是什么？
答案
参考答案：
航天器需要采用较高刚度的结构，比模量高的材料可以使同等刚度结构设计时质量更小。
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选择比模量高的材料作为航天器结构材料的主要目的是什么？
参考答案：
航天器需要采用较高刚度的结构，比模量高的材料可以使同等刚度结构设计时质量更小。
A king was old and he knew it was time to choose a new king. He told all the young people in the country, “I’ll give 51 of you a seed (种子). Plant it and bring it back one year later. Show me the plant that you bring. 52 I’ll choose a new king from you.” A boy 53 Ling got a seed, too. He planted it 54 . But the seed doesn’t grow at all. A year later, Ling had to take his 55 box to the palace. Others all brought beautiful plants there and Ling felt 56 . The king 57 the palace and look around. When he found there was nothing in Ling’s box. The king smiled and said to the others, “One year ago, I gave everyone a seed 58 couldn’t grow. But all of you, 59 Ling, have bought me plants and flowers. Ling was the only one with the honesty (诚实) and 60 to bring such a box. So he will be the new king  ! ”
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