问题
多项选择题
哪些因素影响螺栓的紧固力矩值？（）
A.螺帽的规格
B.螺栓的直径
C.润滑情况
D.螺栓的长度
答案
参考答案：A, B, C
搜题请搜索小程序“爱下问搜题”
哪些因素影响螺栓的紧固力矩值？（）
A.螺帽的规格
B.螺栓的直径
C.润滑情况
D.螺栓的长度
参考答案：A, B, C
| Stress is with us all the time. It comes from mental or emotional activity as well as physical activity. It is unique and personal to each of us. So personal, in fact, that what may be relaxing to one person may be stressful to another. For example, if you’re a busy executive who likes to keep occupied all of the time, "taking it easy" at the beach on a beautiful day may be extremely frustrating, nonproductive, and upsetting. You may be emotionally distressed from "doing nothing." Too much emotional stress can cause physical illnesses such as high blood pressure, ulcers, or even heart disease. Physical stress from work or exercise is not likely to cause such ailments. The truth is that physical exercise can help you to relax and to better handle your mental or emotional stress. |
A source of stress NOT specifically mentioned in this passage is ______.
A．educational activity
B．physical activity
C．mental activity
D．emotional activity