问题
填空题
工程上把延伸率δ>5%的材料称为（）材料，δ<5%的材料称为（）材料。
答案
参考答案：塑性；脆性
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工程上把延伸率δ>5%的材料称为（）材料，δ<5%的材料称为（）材料。
参考答案：塑性；脆性
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| I don't often lose things and I'm especially careful with money. So I was quite 1 when I 2 for my wallet and it wasn't there. 3 I thought it was 4 that I could have 5 it at home. Then I remembered taking it out to 6 the taxi. So I knew I had it with me just before I walked into the 7 . I wondered if it was possible that it could have slipped (滑) out of my pocket while I was eating dinner. Thinking about that possibility, I 8 and walked back to the table where I had been sitting. I asked the waiter to go around the table to see if my wallet was on the 9 . While the waiter was looking for it, the manager of the restaurant came up to me and asked me if 10 was 11 . I didn't want to get lots of people involved (卷入) in the 12 , but I knew I had to get the wallet back. I told the 13 what had happened. He 14 me to describe (描绘) the wallet to him and then he insisted I 15 the missing wallet to the police. But I didn't want the police to involve in it; 16 , I was in a hurry 17 I had an appointment (约会) with my doctor in just a few minutes. I explained to him that my great 18 at the moment was how I could pay the bill. He told me not to worry about that. He had me put 19 my name and 20 , and he said he would send me a bill. | ||||
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