按要求写单词。

1. yes (反义词)                        2. are not (缩写)                               

3. he (复数形式)                      4. I (形容词性物主代词)                   

5. grade (复数)                         6. old (反义词)                                 

7. boy (对应词)                        8. dress (复数)                                 

9. that (对应词)                        10. hello (同义词)                             

复杂截面极件载荷强度计算中，合成应力的最低点即为危险点。