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8岁男孩，左髋部肿痛，跛行，伴低热，盗汗，食欲不振3周。查体：T 37．6℃，左髋部活动受限，Thomas征阳性。髋关节X线片见关节间隙略窄，边缘性骨破坏。其诊断首先应考虑为
A.股骨头坏死
B.髋关节结核
C.急性骨髓炎
D.骨性关节炎
E.急性化脓性关节炎

A.6℃，左髋部活动受限，Thomas征阳性。髋关节X线片见关节间隙略窄，边缘性骨破坏。其诊断首先应考虑为
A.股骨头坏死
B.髋关节结核
C.急性骨髓炎
D.骨性关节炎
E.急性化脓性关节炎

【参考答案】

B
髋关节结核：儿童多见，单侧性的居多。有低热、盗汗等全身表现。“4”字试验、髋关节过伸试验、Thomas征阳性......

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增强型NMOS管的开启电压__________。 A. 大于零 B. 小于零 C. 等于零 D. 或大于零或小于零

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Ten years ago, when environmental lawyer Kassie Siegel went in search of an animal to save the world, the polar bear wasnt at all an obvious choicE.Siegel and Brendan Cummings of the Center for Biological Diversity in Joshua Tree, CaliF., were looking for a species whose habitat was disappearing due to climate change, which could serve as a symbol of the dangers of global warming. Her first candidate met the scientific criteria—it lived in ice caves in Alaskas Glacier Bay, which were melting away—but unfortunately it was a spider. You cant sell a lot of T shirts with pictures of an animal most people would happily step on. Next, Siegel turned to the Kittlitzs murrelet, a small Arctic seabird whose nesting sites in glaciers were disappearing. In 2001, she petitioned the Department of the Interior to add it to the Endangered Species list, but Interior Secretary Gale Norton turned her down. Elkhorn and staghorn coral, which are threatened by rising water temperatures in the Caribbean, did make it onto the list, but as iconic species they fell short insofar as many people dont realize theyre alive in the first placE.The polar bear, by contrast, is vehemently alive and carries the undeniable charisma of a top predator. And its dependence on ice was intuitively obvious; it lives on it most of the year. But it took until 2004 for researchers to demonstrate that shrinking sea ice was a serious threat to the bears population. On FeB.16, 2005—the day the Kyoto Protocol to curb greenhouse-gas emissions took effect, without the participation of the United States—Siegel petitioned to list polar bears as endangereD.Three years later her efforts met with equivocal (不明确的) success, as Interior Secretary Dirk Kempthorne designated the bears as 'threatened' (not endangered), a significant concession from an administration that has stood almost alone in the world in its reluctance to acknowledge the dangers of climate changE.The Endangered Species Act (ESA) , whose odd lists of snails and bladderworts sometimes seemed stuck in the age of Darwin, had been thrust into the mainstream of 21st-century environmental politics. Break out the T shirts!Siegel and Cummings hoped to choose an animal to ______.A.call on people to take actions against global warmingB.make people aware of the danger of environmental damageC.introduce to people a new concept of environmental protectionD.remind people of the importance of protecting endangered species

A.A.call
B.make
C.introduce
D.remind