单项选择题 详细阅读病历摘要,可归纳出以下特点:①老年男性病人;②以排尿异常为主诉,突出的是尿频,逐渐发展为排尿困难,以至排尿不出16小时;③伴有感染现象;④无血尿病史和外伤史;⑤有高血压病史10年;⑥体检有血压高,膀胱区膨隆,皮肤干燥、弹性差;③22时急诊就医。对该病人术前应作哪些准备?病人经抗高血压治疗,血压维持在23/12kPa(180/90mmHg),血尿素氮15.0mmol/L(42mg/dL),血肌酐211μmol/L(2.5mg/dL)。肺最大通气量为50‰尿培养有变形杆菌生长,>100×10菌落/L(>100×10菌落/ml,药敏试验为卡那霉素+++、庆大霉素+++、羧苄青霉素++。拟行耻骨上前列腺切除术。() A. 使病人肺最大通气量维持在60%较好B. 使病人肺最大通气量维持在85%较好C. 术前6~8天应停服抗高血压药物D. 可继续适当服用抗高血压药物至手术日E. 选用卡那霉素抗感染F . 选用庆大霉素抗感染
单项选择题 APP手势操作的测试,一般为检测手机开锁屏对运行中的APP的影响,运行中的APP前后台切换的影响。下列给出的选项,哪一项对于APP手势操作的测试,叙述是错误的。 A 多个运行中的APP切换 B APP运行时关机与运行时重启系统 C APP运行时充电 D APP运行时不用“杀掉”Kill进程,就可以再次打开。
单项选择题 Read a text about "Wind Power in the US" and answer some questions. Wind Power in the US Prompted by the oil crises of the 1970s, a wind-power industry flourished briefly in the United States. But then world oil prices dropped, and funding for research into renewable energy was cut. By the mid 1980s US interest in wind energy as a large-scale source of energy had almost disappeared. The development of wind power at this time suffered not only from badly designed equipment, but also from poor long-term planning, economic projections that were too optimistic and the difficulty of finding suitable locations for the wind turbines. Only now are technological advances beginning to offer hope that wind power will come to be accepted as a reliable and important source of electricity. There have been significant successes in California, in particular, where wind farms now have a capacity of 1500 megawatts, comparable to a large nuclear or fossil-fuelled power station, and produce 1.5 per cent of the state’s electricity. Nevertheless, in the US, the image of wind power is still distorted by early failures. One of the most persistent criticisms is that wind power is not a significant energy resource. Researchers at the Battelle Northwest Laboratory, however, estimate that today wind turbine technology could supply 20 per cent of the electrical power the country needs. As a local resource, wind power has even greater potential. Minnesota’s energy commission calculates that a wind farm on one of the state’s south western ridges could supply almost all that state’s electricity. North Dakota alone has enough sites suitable for wind farms to supply more than a third of all electricity consumed in the continental US. The prevailing notion that wind power is too costly results largely from early research which focused on turbines with huge blades that stood hundreds of metres tall. These machines were not designed for ease of production or maintenance, and they were enormously expensive. Because the major factors influencing the overall cost of wind power are the cost of the turbine and its supporting systems, including land, as well as operating and maintenance costs, it is hardly surprising that it was thought at the time that wind energy could not be supplied at a commercially competitive price. More recent developments such as those seen on California wind farms have dramatically changed the economic picture for wind energy. These systems, like installations in Hawaii and several European countries, have benefited from the economies of scale that come through standardised manufacturing and purchasing. The result has been a dramatic drop in capital costs: the installed cost of new wind turbines stood at $1000 per kilowatt in 1993, down from about $4000 per kilowatt in 1980, and continues to fall. Design improvements and more efficient maintenance programs for large numbers of turbines have reduced operating costs as well. The cost of electricity delivered by wind farm turbines has decreased from about 30 cents per kilowatt-hour to between 7 and 9 cents, which is generally less than the cost of electricity from conventional power stations. Reliability has also improved dramatically. The latest turbines run more than 95 per cent of the time, compared with around 60 per cent in the early 1980s. Another misconception is that improved designs are needed to make wind power feasible. Out of the numerous wind turbine designs proposed or built by inventors or developers, the propeller-blade type, which is based on detailed analytical models as well as extensive experimental data, has emerged as predominant among the more than 20,000 machines now in commercial operation world-wide. Like the gas-driven turbines that power jet aircraft, these are sophisticated pieces of rotating machinery. They are already highly efficient, and there is no reason to believe that other configurations will produce major benefits. Like other ways of generating electricity, wind power does not leave the environment entirely unharmed. There are many potential problems, ranging from interference with telecommunications to impact on wildlife and natural habitats. But these effects must be balanced against those associated with other forms of electricity generation. Conventional power stations impose hidden costs on society, such as the control of air pollution, the management of nuclear waste and global warming. As wind power has been ignored in the US over the past few years, expertise and commercial exploitation in the field have shifted to Europe. The European Union spends 10 times as much as the US government on research and development of wind energy. It estimates that at least 10 per cent of Europe’s electrical power could be supplied by land-based wind-turbines using current technology. Indeed, according to the American Wind Energy Association, an independent organisation based in Washington, Denmark, Britain, Spain and the Netherlands will each surpass the US in the generating capacity of wind turbines installed during the rest of the decade. 1 Which one of the statements is true?A、Cost was a big factor in preventing the development of wind powerB、Wind power can provide enough electricty for the United StatesC、Some US states are powered solely by windD、Wind power has developed steadily since the 1970s.