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在利用网络RTK虚拟基站技术(VRS)与主副站技术(MAC)时，两个相邻基站之间的距离最大不能超过( )。
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Women have more problems than men in old age. First of all, they have less money—or no money at all—and because of this, they often feel they get less respect, even at home. Quite a large number have no pension (退休金) because they have never worked outside the home, and thirty-eight percent are supported mainly by their husbands or children. Second, a larger number of old women than old men become widows (single women). Men are normally older than the women they marry, and women generally live longer than men. The remarriage among older widows is lower than that among widowers (single men). Statistics (统计) from 1990 in Shanghai show only 52 percent of elderly women with husbands still living, compared to (与……相比) 82 percent of men.Because of lower incomes and the difficulty of remarriage, many elderly women who live alone, are poor and have almost no social life. Even an old couple lives with children, it is the woman who ends up doing the work around the house. She cleans the rooms, prepares meals, and takes care of the family. Some 75 percent of them carry out such heavy physical tasks as buying and carrying grain, coal and other supplies for the home. How to improve the quality of life of women in their later years is a problem that needs to be dealt with by all the society. If they had more money, elderly women().
Women have more problems than men in old age. First of all, they have less money—or no money at all—and because of this, they often feel they get less respect, even at home. Quite a large number have no pension (退休金) because they have never worked outside the home, and thirty-eight percent are supported mainly by their husbands or children. Second, a larger number of old women than old men become widows (single women). Men are normally older than the women they marry, and women generally live longer than men. The remarriage among older widows is lower than that among widowers (single men). Statistics (统计) from 1990 in Shanghai show only 52 percent of elderly women with husbands still living, compared to (与……相比) 82 percent of men.Because of lower incomes and the difficulty of remarriage, many elderly women who live alone, are poor and have almost no social life. Even an old couple lives with children, it is the woman who ends up doing the work around the house. She cleans the rooms, prepares meals, and takes care of the family. Some 75 percent of them carry out such heavy physical tasks as buying and carrying grain, coal and other supplies for the home. How to improve the quality of life of women in their later years is a problem that needs to be dealt with by all the society. In Shanghai, of 150 elderly women, only () have husbands still living.
The Christmas TreeIn pre-Christian Europe, people believed that trees (fruit trees and evergreens in particular) were embodiment of powerful beings. In the fourteenth and fifteenth centuries, the designated miracle play for December 25 was the story of Adam and Eve and in this play the chief prop was an apple-hung evergreen called the paradise tree. In the sixteenth century, German families began bringing evergreens into their homes during the Christmas season. By the seventeenth century, they were known as Christbaiime (Christ trees) and were being decorated with fruits, candies, cookies, candles and wafers resembling the eucharistic host.The first Christmas trees in America were set up by German immigrants in the 1820s and the almost universal adoption of the custom dates from the 1910s. Now at Christmas time decorated trees stand in about two-thirds of American homes. The modem American tree is usually covered with colored balls and strings of colored lights. The star on top represents the Star in the East which guided the three Wise Men to Bethlehem. Christmas is traditionally celebrated on().
写信时间：2008年3月18日写信人：刘书红收信人：Denver Institute of Technology信息工程系North教授地 址：Denver，Colorado 80202，U．S．
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