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经测量某线路末端所接负载没有从系统吸收无功功率,则该段线路上不会流过无功功率。
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多级电压开式网中变压器采用Π型等值电路时,在潮流计算中不需要进行电压折算就可以得到各节点电压的实际值。
因为高压输电线路传输功率会产生功率损耗,因此高压线路末端电压一定低于首端电压。
1、 理解贝叶斯分类模型的原理；2、 掌握贝叶斯分类的建模过程；3、 熟悉贝叶斯分类的应用。
Reading comprehension.Recreational tree climbing is taking root in the ecotourism industry, and it’s sending guys like Tim Kovar to far off reaches of the globe. Kovar, a tree-climbing instructor, recently returned to the U.S. from Brazil, where he spent time developing a tree-climbing operation thanks to the “slow travel” movement. Slow travel, is like the slow food movement, the practice of giving fast food in favor of homegrown cooking—the kind that takes hours to prepare and enjoy. Likewise, slow travel urges visitors to experience a place’s natural surroundings and learn about the ecology in a way not afforded by extreme games. “Tree climbing is a slow activity,” says Kovar. “It’s not something you do quickly and then you're on to the next thing or event.” There is no such thing as a quick climb, especially for beginners. This wasn’t a race against the clock or the fellow climbers. In fact, tree climbing is unlikely to ever become a feature of the extreme games. Many climbers refuse competition. There has already been so much competition in the world. “When you stand below the tree, it can be amazing,” Rusel DeMaria says, looking affectionately up at Michael’s Triumph, a 150-foot-tall tree. But reaching the treetop, he adds, is an entirely different feeling. Likewise, his wife, Viola Brumbaugh, kneels on the ground and asks Michael’s Triumph for permission to climb. “It goes a lot smoother that way.” She says. And climbing has been included into many educational programs. New Tribe offers guided climbs through its school, Tree Climbing Northwest, where “we teach enough tree biology and forest ecology to raise awareness in our students,” says New Tribe present Sophis Sparks. “We know that the tree climbing experience deepens personal appreciation for trees. After climbing, people value trees more and are motivated to support preservation. This is not just to preserve their playground.” Perhaps that is why he struggles with the term “recreational tree climbing,” saying, “I prefer to call it inspirational tree climbing.”What do slow travel and the slow food movement have in common?
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