单选题脑电图正确的叙述是( ) A．正常人思考时，脑电图以α波为主 B．高频低幅波是同步化的表现 C．低频高幅波是去同步化的表现 D．可反映大脑皮质的兴奋状态 E．睡眠中脑电波都是低频波

单选题乳腺单纯癌是指

单选题The Southdale shopping centre in Minnesota has an atrium, a food court, fountains and acres of parking. Its shops include a Dairy Queen, a Victoria's Secret and a purveyor of comic T-shirts. It may not seem like a landmark, as important to architectural history as the Louvre or New York's Woolworth Building. But it is. "oh, my god!" chimes a group of teenage girls, on learning that they are standing in the world's first true shopping mall. "That is the coolest thing anybody has said to us all day. " In the past half century Southdale and its many imitators have transformed shopping habits, urban economies and teenage speech. America now has some 1,100 enclosed shopping malls, according to the International Council of Shopping Centres. Clones have appeared from Chennai to Martinique. Yet the mall's story is far from triumphal. Invented by a European socialist who hated cars and came to deride his own creation, it has a murky future. While malls continue to multiply outside America, they are gradually dying in the country that pioneered them. Southdale's creator arrived in America as a refugee from Nazi-occupied Vienna. Victor Gruen was a Jewish bohemian who began to design shops for fellow immigrants in New York after failing in cabaret theatre. His work was admired partly for its uncluttered, modernist look, which seemed revolutionary in 1930s America. But Gruen's secret was the way he used arcades and eye-level display cases to lure customers into stores almost against their will. As a critic complained, his shops were like mousetraps. A few years later the same would be said of his shopping malls. By the 1940s department stores were already moving to the suburbs. Some had begun to build adjacent strips of shops, which they filled with boutiques in an attempt to re-create urban shopping districts. In 1947 a shopping centre opened in Los Angeles featuring two department stores, a cluster of small shops and a large car park. It was, in effect, an outdoor shopping mall. Fine for balmy southern California, perhaps, but not for Minnesota's harsh climate. Commissioned to build a shopping centre at Southdale in 1956, Gruen threw a roof over the structure and installed an air-conditioning system to keep the temperature at 75°F (24℃)—which a contemporary press release called "Eternal Spring". The mall was born. Gruen got an extraordinary number of things right first time. He built a sloping road around the perimeter of the mall, so that half of the shoppers entered on the ground floor and half on the first floor-something that became a standard feature of malls. Southdale's balconies were low, so that shoppers could see the shops on the floor above or below them. The car park had animal signs to help shoppers remember the way back to their vehicles. It was as though Orville and Wilbur Wright had not just discovered powered flight but had built a plane with tray tables and a duty-free service.

单选题风湿病的病因和发病机制的描述中，哪一项是不恰当的

单选题A．瓣膜穿孔B．瓣膜增厚、粘连、卷曲C．室间隔缺损D．瓣膜闭锁缘粟粒状赘生物E．在已有病变的心瓣膜上形成菜花状、易脱落的赘生物

单选题下列哪一项不是促胰液素的作用

单选题A．微动脉B．微静脉C．小动脉和毛细血管D．小静脉和毛细血管

单选题雄激素的作用，哪项是不正确的( )(1990年)

单选题哪种因素与血栓形成无关

单选题下列选项中，属于慢性虫卵结节主要成分的有

单选题在一昼夜中，一般人体温度最低的时间在( ) A．清晨2～5时 B．清晨起床后 C．下午1～2时 D．晚上睡觉前

单选题对于耳蜗内电位的叙述，恰当的是

单选题心肌代谢活动增强可使冠脉血流量增加，下列哪一因素作用最强 A．缺氧 B．腺苷 C．H+ D．CO2

单选题逆流倍增机制的原动力主要是( ) A．近曲小管主动重吸收 B．髓袢升支主动重吸收 C．集合管主动重吸收 D．髓袢降支主动重吸收 E．髓袢降支细段主动重吸收

单选题与宫颈癌发生关系密切的人类病毒是

单选题A．患者多为儿童B．发病部位以皮肤及胃肠道多见C．属于自然杀伤细胞来源的侵袭性淋巴瘤D．缺失的特征性遗传学改变

单选题肾重吸收葡萄糖的部位是( )(2003年)

单选题A．呼吸道传播B．消化道传播C．血道播散引起D．经伤口感染E．经蚊虫传播

单选题 干扰素是 ( ) A、细胞对细菌感染的反应产物，能引起发热 B、细胞对细菌感染的反应产物，能抑制发热 C、细胞对病毒感染的反应产物，能引起发热 D、细胞对病毒感染的反应产物，能抑制发热 E、病毒本身分泌的物质，能引起机体发热

单选题 如图所示，对该病变的描述不正确的是 ( ) A、常继发于肢体末端的坏死 B、呈黑褐色 C、坏死组织与周围组织边界清楚 D、常伴有明显的全身中毒症状 E、以上都不是