问题
多项选择题
关于压力容器应力中二次应力说法错误的是:()
A.二次应力是指平衡外加机械载荷所必需的应力。
B.二次应力可分为总体薄膜应力、弯曲应力、局部薄膜应力。
C.二次应力是指由相邻部件的约束或结构的自身约束所引起的正应力或切应力。
D.二次应力是局部结构不连续性和局部热应力的影响而叠加道一次应力之上的应力增量
答案
参考答案:A, B, D
关于压力容器应力中二次应力说法错误的是:()
A.二次应力是指平衡外加机械载荷所必需的应力。
B.二次应力可分为总体薄膜应力、弯曲应力、局部薄膜应力。
C.二次应力是指由相邻部件的约束或结构的自身约束所引起的正应力或切应力。
D.二次应力是局部结构不连续性和局部热应力的影响而叠加道一次应力之上的应力增量
参考答案:A, B, D
选词填空。 | |
2. I need to see the person _____ is responsible for the project. 3. I know the man _____ bike was stolen yesterday. 4. I will remember those days _____ we were together. 5. I want to buy the fruits _____ are fresh and cheap. 6. Tell me _____ you were talking with on the phone when I opened the door. 7. This is the place _____ Confucius was born. |