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透明网桥的MAC地址表要记录( )、端口与时间3类信息。
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The coastlines on the two sides of the Atlantic Ocean present a notable parallelism: the easternmost region of Brazil, in Pernambuco, has a convexity that corresponds almost perfectly with the concavity of the African Gulf of Guinea, while the contours of the African coastline between Rio de Oro and Liberia would, by the same approximation, match those of the Caribbean Sea. Similar correspondences are also observed in many other regions of the earth. This observation began to awaken scientific interest about sixty years ago, when Alfred Wegener, a professor at the University of Hamburg, used it as a basis for formulating a revolutionary theory in geological science. According to Wegener, there was originally only one continent or landmass, which he called Pangea. Inasmuch as continental masses are lighter than tile base on which they rest, he reasoned, they must float on the substratum of igneous rock, known as sima, as ice floes float on the sea. Then why, he asked, might continents not be subject to drifting The rotation of the globe and other forces, he thought, had caused the cracking and, finally, the breaking apart of the original Pangea, along an extensive line represented today by the longitudinal submerged mountain range in the center of the Atlantic. While Africa seems to have remained static, the Americas apparently drifted toward the west until they reached their present position after more than 100 million years. Although the phenomenon seems fantastic, accustomed as we are to the concept of the rigidity and immobility of the continents, on the basis of the distance that separates them it is possible to calculate that the continental drift would have been no greater than two inches per year. Sima, as described in this passage, is ______.
小王和小刘两同学关于法的分类以及法的渊源的辩论如下：小王认为：①按照法的效力、内容和制定法的程序的不同，法律可以分为一般法和特别法。②国际公约现在是中国法的渊源。③我国的行政法规就是由国家行政机关颁布的法律。小刘认为：①我国数量最大的一类法律渊源就是行政法规。②随着全球化的趋势的不断发展，大陆法系和英美法系的区别在减少，现在判例法已经成为大陆法系的正式的法的渊源。③“试行”和“暂行”的法规的效力同其他法律是一样的。④国务院各部委和地方行政机关制定的规章也是行政法规。他们两人观点正确的是( )。
下列选项中，关于100BASE-T4特征的描述不正确的是( )。
Directions: Read the following passage carefully and then translate each underlined part into Chinese. Desertification in the arid United States is flagrant. Groundwater supplies beneath vast stretches of land are dropping precipitously. Whole river systems have dried up; others are chocked with sediment washed from denuded land. 71. Hundreds of thousands of acres of previously irrigated cropland have been abandoned to wind or weeds. Several million acres of natural grassland are eroding at unnaturally high rates as a result of cultivation or overgrazing. All told, about 225 million acres of land are undergoing severe desertification. 72. Federal subsidies encourage the exploitation of arid land resources. Low-interest loans for irrigation and other water delivery systems encourage farmers, industry, and municipalities to mine groundwater. Federal disaster relief and commodity programs encourage arid-land farmers to plow up natural grassland to plant crops such as wheat and, especially cotton. Federal grazing fees that are well below the free market price encourage overgrazing of the commons. The market, too, provides powerful incentives to exploit arid land resources beyond their carrying capacity. 73. When commodity prices are high relative to the farmer’s or rancher’s operating costs, the return on a production-enhancing investment is invaribly greater than the return on a conservation investment. And when commodity prices are relatively low arid land ranchers and farmers often have to use all their available financial resources to stay solvent. 74. If the United States is, as it appears, well on its way toward overdrawing the arid land resources then the policy choice is simply to pay now for the appropriate remedies or pay far more later, when productive benefits from arid - land resources have been both realized and largely terminated.
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