问题
填空题
曲轴疲劳裂纹是由过高的扭转应力、扭振附加应力和油孔口严重的（）引起的。
答案
参考答案：应力集中
搜题请搜索小程序“爱下问搜题”
曲轴疲劳裂纹是由过高的扭转应力、扭振附加应力和油孔口严重的（）引起的。
参考答案：应力集中
| Read and choose. 补全对话。 | |
| Tom: 1 Li Hua: I went to a movie. Tom: 2 Li Hua: I went there by bike. Tom: 3 Li Hua: Nobody, but there were many people in the cinema. Tom: 4 Li Hua: Yes, I enjoyed the music and the songs very much. Tom: 5 Li Hua: That's great. I think you'll like it if you go to see it. 1. 2. 3. 4. 5.
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