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以下说法正确的是______。
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IEEE 802.11a定义了使用红外、跳频扩频与直接序列扩频技术，IEEE 802.11b定义了使用直序扩频技术，传输速率为1Mbps、2Mbps、5.5Mbps与
根据如下资料建立账套，进行账务处理。并编制资产负债表和利润表。 会计科目表及某年12月份期初余额： 科目编码 科目名称 方向 期初余额(元) 期初数量 1001 库存现金 借 5000 1002 银行存款 借 260000 1012 其他货币资金 借 1 101 交易行金融资产 借 200000 1122 应收账款 借 8900 112201 星火公司 借 5000 112202 电子公司 借 3900 1221 其他应收款 借 1401 材料采购 借 1403 原材料 借 144000 140301 甲材料 借 104000 10400 140302 乙材料 借 40000 8000 1405 库存商品 借 110000 140501 甲产品 借 50000 500 140502 乙产品 借 60000 800 1511 长期股权投资 借 1601 固定资产 借 2500000 1602 累计折旧 贷 50000 1801 长期待摊费用 借 30000 2001 短期借款 贷 70000 2201 应付票据 贷 2202 应付账款 贷 15000 220201 创新公司 贷 6000 220202 新华公司 贷 9000 2203 预收账款 贷 2211 应付职工薪酬 贷 221101 应付工资 贷 221102 应付福利费 贷 2221 应交税费 贷 3500 222101 应交增值税 贷 22210101 进项税额 贷 22210105 销项税额 贷 22210107 未交增值税 贷 2000 222106 应交所得税 贷 1500 2232 应付股利 贷 2241 其他应付款 贷 2501 长期借款 贷 251000 4001 股本 贷 2781400 4002 资本公积 贷 4101 盈余公积 贷 87000 410101 法定盈余公积 贷 87000 410103 法定公益金 贷 4103 本年利润 贷 4104 利润分配 贷 410402 提取法定盈余公积 贷 410403 提取法定公益金 贷 410410 应付普通股股利 贷 410415 未分配利润 贷 5001 生产成本 借 500101 甲产品 借 500102 乙产品 借 5101 制造费用 借 6001 主营业务收入 借 6051 其他业务收入 借 6301 营业外收入 借 6401 主营业务成本 借 6402 其他业务成本 借 6601 销售费用 借 6602 管理费用 借 6603 财务费用 借 6711 营业外支出 借 6801 所得税费用 借
The Mir Space Station The Russian Mir Space Station, which came down in 2001 at last after 15 years of pioneering the concept of long-term human space flight, is remembered for its accomplishments in the human space flight history. It can be credited with many firsts in space. During Mir’s lifetime, Russia spent about USS 4.2 billion to build and maintain the station. The Soviet Union launched Mir, which was designed to last from three to five years, on February 20, 1986, and housed 104 astronauts over 12 years and seven months, most of whom were not Russian. In fact, it became the first international space station by playing host to 62 people from 11 countries. From 1995 through 1998, seven astronauts from the United States took turns living on Mir for up to six months each. They were among the 37 Americans who visited the station during nine stopovers by space shuttles. The more than 400 million the United States provided Russian for the visits not only kept Mir operating, but also gave the Americans and their partners in the international station project valuable experience in long-term flight and multinational operations. A debate continues over Mir’s contributions to science. During its existence, Mir was the laboratory for 23,000 experiments and carried scientific equipment, estimated to be worth $ 80 million, from many nations. Experiments on Mir are credited with a range of findings, from the first solid measurement of the ration of heavy helium atoms in space to how to grow wheat in space. But for those favoring human space exploration, Mir showed that people could live and work in space long enough for a trip to Mars. The longest single stay in space is the 437.7 days that Russian astronaut Valery Polyakov spent on Mir from 1994 to 1995. And Sergie Avdeyev accumulated 747.6 days in space in three trips to the space station. The longest American stay was that of Shannon Lucid, who spent 188 days aboard Mir in 1996. Despite the many firsts Mir accomplished, 1997 was a bad year out of 15 for Mir. In 1997, an oxygen generator ’caught fire. Later, the main computer system broke down, causing the station to drift several times and there were power failures. Most of these problems were repaired, with American help and suppliers, but Mir’s reputation as a space station was mined. Mir’s setbacks are nothing, though, when we compare them with its accomplishments. Mir was a tremendous success, which will be remembered as a milestone in space exploration and the space station that showed long-term human habitation in space was possible. But it’s time to move on to the next generation. The International Space Station being built will be better, but it owes a great debt to Mir. When we think of Mir in terms of its achievements, its setbacks are______.
下列关于防火墙技术的描述中，错误的是
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