问题
选择题
| 给出下列命题： ①若平面α上的直线a与平面β上的直线b互为异面直线，c是α与β的交线，那么c至多与a、b中的一条相交； ②若直线a与b异面，过不在直线a、b上一点A可作一条与a和b都相交的直线； ③若直线a与b异面，则存在唯一 一个过a的平面α与b平行． 其中正确的命题为（ ）
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答案
答案：C
搜题请搜索小程序“爱下问搜题”
| 给出下列命题： ①若平面α上的直线a与平面β上的直线b互为异面直线，c是α与β的交线，那么c至多与a、b中的一条相交； ②若直线a与b异面，过不在直线a、b上一点A可作一条与a和b都相交的直线； ③若直线a与b异面，则存在唯一 一个过a的平面α与b平行． 其中正确的命题为（ ）
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答案：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. |
This article, published by the Department of Health and Human Services, probably came from the ______.
A．Federal Bureau of Investigation
B．Alcohol, Drug Abuse, and Mental Health Administration
C．Education Administration
D．Communicable Diseases Administration