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A,息票利率＜到期收益债券价格＞票面价值
B,息票利率＜到期收益债券价格到期收益债券价格到期收益债券价格＞票面价值
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给定关系模式R，其中属性集 U={A，B，C，D，E，G ，H} 函数依赖集F= {A→B，AE→H，BG→DC，E→C，H→E } ，下列函数依赖不成立的是（）
Heat Is Killer
Extremely hot weather is common in many parts of the world. Although hot weather just makes most people feel hot, it can cause serious medical problems- even death. Floods, storms, volcano eruptions and other natural disasters kill thousands of people every year. __________ (46) Experts say heat may be nature&39;s deadliest killer. Recently, extreme heat was blamed for killing more than one hundred people in India. It is reported that the total heat of a hot day or several days can affect health.
__________(47) Experts say heat waves often become dangerous when the nighttime temperature does not drop much from the highest daytime temperature. This causes great stress on the human body.
__________ (48) stay out of the sun, if possible. Drink lots of cool water. Wear light colored clothing made of natural materials; avoid wearing synthetic clothing. Make sure the clothing is loose, permitting freedom of movement. And learn the danger signs of the medical problems, such as headache and vomiting that are linked to heat. __________ (49) The pain is a warning that the body is becoming too hot. Doctors say those suffering headache or muscle pain should stop all activity and rest in a cool place and drink cool liquids. Do not return to physical activity for a few hours because more serious conditions could develop.
Doctors say some people face an increased danger from heat stress. __________ (50) Hot weather also increases dangers for people who must take medicine for high blood pressure, poor blood flow, nervousness or depression.$amp;第46题__________ 查看材料;$br＞
Help Your Child Become a Reader
Encouraging early reading skills can build a path to a lifelong (终身的 ) love of reading and can help your child get a head start in school. While reading to your child is still the most important thing you can do to build reading skills, there are many techniques that can help.
Make reading fun. Play games with your child as you read. Many traditional children&39;s games can be adapted to encourage reading skills.
While reading or during play, tell your child, "I spy with my little eye, something that begins with the letter b." Help the child find something on the page or in the room that begins with that letter. For example, "I see a barn." This can also be used to teach beginning letter sounds. "I spy with my little eye.
Something that begins with the sounds." Help the child find a word that begins with the "s" sound.
In this variation on the popular game, instruct the child that, "Simon says, &39;point to something that starts with the letter n&39;." The child can then find an object in the room or a body part, such as the nose,that starts with the letter presented. This can also be used to teach beginning sounds.
Make a game out of rhyming (押韵) words by making up silly words to rhyme with the child&39;s name or favorite toys. This sets the stage for rhyming real words by showing the child the similarities of sounds. As the child masters making up the words, begin rhyming real words to one another.
Tips to raise a successful reader:
Put books in places where the child plays. If books are easily accessible, children are more likely to pick them up.
Let children "read to you" by looking at pictures. Making up stories to go along with illustrations helps children discover how words relate to pictures.
Take books along on trips or even short visits to the doctor&39;s office or grocery store.
Have children help you shop. Reading grocery lists and looking for specific items help build sight vocabulary.
A good reading habit can help your child do well at school. 查看材料
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