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土的抗剪强度与该面上正应力大小的关系为______。
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根据以下材料，回答1~15题。 求助者：女性，18岁，大专学生。 下面是心理咨询师与求助者的一段咨询谈话： 心理咨询师：你好，请坐。你有什么问题，咱们谈谈吧! 求助者：我心情不好，烦躁，老感到有什么事情要发生，你能帮帮我吗心理咨询师：你能谈谈心情怎么了吗什么让你烦躁 求助者：我原先学习一直很好，一年前因为头痛，期末考试没考好，以后一到考试前就紧张、心慌。近一个月来，不愿去教室，在教室里总感到心慌，看书也不能集中注意力。现在人多时，就感到浑身不舒服，呼吸都感到不顺畅，当众写字，手会发抖。睡眠也不好。你说我该怎么办我不学习就没办法毕业，前途就毁了。 心理咨询师：哦，听你说的情况，我也很为你着急，本来应该在学校上课，却为此缺课这么多，这让你感到心烦是吗 求助者：是的，所以就来求你告诉我该怎么办。 心理咨询师：我想告诉你，我年轻时也曾考试紧张，所以，我很理解你现在的心情。 求助者：你能告诉我怎么办吗 心理咨询师：我还需要进一步了解你的情况，然后我们共同讨论下一步怎么办，好吗 心理咨询师在这段咨询中没有表达（ ）。
Text 2 A lot happens to your teeth. They are ground, braced, brushed, flossed, polished, drilled, filled, and if you do not take care of them, pulled. For your teeth, proper oral care is as essential as anything else you do for your body and your generally health. Fortunately, if there is any damage to your teeth modem dentistry techniques make it easier, faster and less painful to get the problem fixed. By definition, dentistry includes the study, diagnosis, treatment and the prevention of disease of the mouth, teeth, gum and jawbones. Today’s dentists use sophisticated equipment and pain- preventing medicines, but these have not always been around. The earliest historical records of dentistry are from Egypt from around 3600 BC. Aesculapius, a Greek physician who lived around 1250 BC, is credited with the idea of pulling disease teeth. Hippocrates, around 400 BC, wrote of applying ointments and using branding irons to treat disease of the mouth. Through the Middle Ages wealthy people were treated by physicians and surgeons, while poor people could look to the local barber to pull painful teeth. Modem dentistry emerged with the release of Pierre Fauchard’s book The Surgeon Dentist, A Treatise on Teeth. Fauchard is considered the father of modem dentistry. Later, the first school devoted to teaching dentistry opened in Baltimore in the USA in 1840. Green Vardiman Black invented a foot engine so dentists would have two free hands while using the dental drill. He also came up with the idea that gum disease was an infection caused by bacteria. This was later confirmed in 1960. An important contribution was made in 1944 when Dr. Horace Wells, a Connecticut dentist, first used nitrous oxide (laughing gas) as an oral anesthetic; today this method of administering anesthetic is employed for many dental and medical surgeries. The introduction of fluoride in toothpaste in the 1960s was a huge breakthrough; teenagers and adults today have a 50% better chance of not developing tooth decay. The 1990s saw a change in thinking when it came to fillings for cavities in teeth. Since the early 1800s silver amalgam--a combination of silver, tin and mercury--has been the standard filling compound. But modern fears about mercury poisoning have led many people to have their amalgam fillings replaced with plastic polymer fillings. Besides not having any mercury, plastic polymers have an advantage over metal fillings because the color can be matched to the surroundings tooth and the material can be chemically bonded to the tooth. Dentistry methods are sure to advance even more in the future. Things such as laser technology, which is used to eliminate diseased tissue or weld together damaged parts of teeth, will soon become a common practice in dentists’ offices. And computer-assisted technology is ushering in new advances in the area of tooth restoration. The primary goal of dentists is to develop early detection methods to prevent dental conditions from turning into dental problems. Caring for your teeth properly will lessen the number of visits you make to the dentist. Brushing properly, flossing every day, getting a professionally cleaning every six months and maintaining a diet low in sugar can aid in keeping your teeth healthy. Your teeth will stay in your’ mouth if you take care of them. Teenagers and adults have had a 50% better chance of not developing tooth decay since
The movement of the sun creates periods of ______.
What is the Greenwich Mean Time called now
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