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显示工资最高的三位职工信息，应使用语句：$ETECT *【 】FROM职工ORDERBY工资DESC
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Like fine food, good writing is something we approach with pleasure and enjoy from the first taste to the last. And good writers, like good cooks, do not suddenly appear full-blown. Quite the contrary, just as the cook has to undergo an intensive training, mastering the skills of his trade, the writer must sit at his desk and devote long hours to achieving a style in his writing, whatever its purpose—school work, matters of business, or purely social communication. You may be sure that the more painstaking the effort, the more effective the writing, and the more rewarding.There are still some remote places in the world where you might find a public scribe to do your business or social writing for you, for a fee. There are a few managers who are lucky enough to have the service of that rare kind of secretary who can take care of all sorts of letter writing with no more than a quick note to work from. But for most of us, if there is any writing to be done, we have to do it ourselves.We have to write school papers, business papers or home papers. We are constantly called on to put words to paper. It would be difficult to count the number of such words, messages, letters, and reports put into the mails or delivered by hand, but the daily figure must be enormous. What is more, everyone who writes expects, or at least hopes, that his writing will be read. We want to arouse (引起) and hold the interest of the readers. We want whatever we write to be read, from first word to last, not just thrown into some "letters-to-be-read" file or into a wastepaper basket. This is the reason we bend our efforts toward learning and practicing the skills of interesting, effective writing. According to the passage, some managers don"t have to do any letter writing because （）
使用WWW浏览器浏览网页时，用户可用鼠标点击某个超链接，从协议分析的角度看，此时，浏览器首先需要进行（）。
In everyday usage "hot" means "having a lot of heat". Many people think that "cold" is something completely separated from heat. But this is not true. Cold simply means "having very little heat". Your life depends on heat. In fact, every living thing depends on it. Without heat, every living thing would be frozen to death. All living things get their heat from the sun, which provides the conditions in which life is possible.Since before the dawn of history, man has been able to make his own heat. He has been able to release the sun"s heat that is trapped in things such as wood, coal and oil. And he has been able to use this heat.Heat has made civilization possible. With heat, man could melt metals. As man learned to use metals and fuels, industries grew. As a result, engines were invented. These are machines that change heat energy into mechanical energy. Engines can do the work of many men. Without engines industrial civilization is impossible.Yet when the first engines were built in the 17th century, men were still wondering about the nature of heat. "What is it" they asked. Not until the early years of the 19th century did they find the right answer. In everyday usage, "hot" means ______.
横截面尺寸为25mm×10mm的矩形波导中填充介质为空气，若要实现单模传输，则电磁波的工作频率范围为______。
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