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某女性患者，50岁，缺失，余牙正常，义齿修复设计金属支架，上设置RPI卡环组。

RPI卡环组的优点，错误的是（）

A.减小对基牙扭力

B.减轻牙槽嵴的负担

C.病人感觉舒适

D.基牙龋坏机会少

E.在水平方向的稳定作用强

答案

参考答案：B

单项选择题

男性，25岁，因活动后胸痛就诊，超声心动图显示室间隔流出道部分向左心室突出、二尖瓣前叶在收缩期前移，左室顺应性降低。最有效的治疗药物是（）

A.硝酸甘油

B.血管紧张素转换酶抑制剂

C.洋地黄

D.吗啡

E.β受体阻滞剂
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问答题

Some of the most popular attractions across America are the many free concerts offered to the public throughout the year. These involve not only amateur performers, but professional artists as well. The public parks of many cities across the country usually have bandstands and large lawns. As a service to citizens, they rent out space to performers free of charge. Amateur groups, with nothing more than a desire to perform, offer their talents freely to the public. Semi. professional artists are pleased to get the chance to perform before the public to perfect their craft and nurture the hope of being discovered before beginning a professional career. Famous professionals also give free concerts to make contact with their admiring fans. Often such concerts are sponsored by a large corporate organization and offered to the public free of charge as a cultural service and support for the arts.
The free concerts feature all kinds of music from rock and roll, jazz, country-western to the classics. In addition, free performances may include the plays of Shakespeare or experimental theater of modem dramatists. In New York’s Central Park there has long been a summer Shakespeare festival which draws huge crowds to the free performances.
Of these concerts the ones held on a summer evening in the park are the most popular. They take on a festive air. Friends and groups gather together after work and spread out a blanket on the lawn facing the performers’ stage. The early comers get the best locations and enjoy a picnic supper while it is still daylight. The free seating is on a first come basis. Therefore, by the time the concert begins, as many as five thousand or more people may be in attendance. The concerts usually begin at 8 p. m. and are performed under the stars. The sound is made sufficiently loud SO that no matter where one chooses to sit, he Can hear very well. The only disturbance may be the sound of an overhead airplane on its final approach to an airport or the far-off siren(警笛声) of all ambulance on its way to the hospital. This matters little! What counts is to soak up the atmosphere created by the music and to be with friends in the flesh open air. The best part of it all is that it’s free !
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