某女性患者，39岁，右半侧牙遇冷热疼3周。患者个月前右上后牙在外院已做牙髓治疗，治疗后原症略缓解，遇热仍疼，且偶有自发痛。检查：近中咬面银汞充填完好，叩(+)，冷测反应均迟钝，热水可起痛，持续数分钟。冠完整，牙尖高耸，见近中边嵴一隐裂纹，涂碘酊染色不明显，叩：(－)，在裂纹处热测均较对照牙略敏感，其余未见异常。残根，叩(－)，周围牙龈略红，探之易出血

为解决主诉症状，首先应做

A:再行根管治疗 B:调合 C:根管治疗 D:塑化治疗 E:拔除

某女性患者，21岁，外伤导致冠折，露髓，折断面至龈下2．5mm，x线片显示，折断面在牙槽骨下1mm，根长14mm，折断面平齐龈缘，根长11mm，松动Ⅱ度，无松动

初诊后首先的治疗步骤是

A:拔除└1 B:拔除└12 C:└12根管治疗 D:└2根管桩+树脂核+烤瓷冠修复 E:A+D

某女性患者，21岁，外伤导致冠折，露髓，折断面至龈下2．5mm，x线片显示，折断面在牙槽骨下1mm，根长14mm，折断面平齐龈缘，根长11mm，松动Ⅱ度，无松动

下列处理措施中，正确的是

A:患牙根管治疗后观察一段时间再修复 B:立即桩冠修复 C:立即采用覆盖义齿修复 D:因患牙松动，└2牙根短，拔牙后可摘或固定局部义齿修复 E:立即全冠修复

某男性患者，47岁。咳嗽2周入院。干咳，无咯血，无畏寒、发热，否认结核病史。一直从事银行业工作。血常规：WBC6.7×10/L，其中N52%,L40%,E0.8%.PPD(1:2000)试验：(±),ESR35mm/h。胸部CT示右下肺内基底段见一约1.6cm×1.8cm结节，无分叶、毛刺及胸膜牵拉征。为进一步鉴别结节性质，拟行F-FDGPET/CT显像。

对可能出现的F-FDGPET/CT征象的解读不正确的是

A:SUV低于2．0，考虑结节良性病变可能性大 B:SUV高于2.5，且延迟相SUV超过早期相SUV，考虑结节恶性病变可能性大 C:恶性肿瘤病变SUV与病灶病理分化程度呈正相关 D:恶性肿瘤病变SUV愈高，则患者预后相对愈差 E:若患者血糖水平增高，分析F-FDGPET/CT结果时应考虑血糖水平的影响 F:错构瘤常呈阳性结果

某男性患者，67岁，慢性咳嗽、咳痰20余年，进行性气急加重5年。一周前因感冒后病情恶化入院，血气分析（呼吸空气时）示pH7.30，PaO48mmHg，PaCO65mmHg，予以低浓度氧疗。

本例强调低浓度氧疗是为了避免

A:氧中毒 B:"吸收性"肺不张 C:CO潴留加重 D:氧气浪费 E:以上都不是

Across the Deserts

　　The SaharaDesertis the largest desert in the world. It stretches across Africa fromSenegaltoEgypt. TheSaharaDesertis an unfriendly environment. During the day it"s very hot, and at night it’s sometimes very cold. It is also difficult to find water in theSahara.

　　In 2006, Kevin Lin, Ray Zahab, and Charlie Engle decided to do something very difficult. They made the decision to run across the Sahara Desert 4,300 miles (6,920km). It seemed impossible to do, but they wanted to try. The three men liked to test themselves, and this would be a very big test.

　　On the morning of November 2, Kevin, Ray, and Charlie started their trip across theSahara. Every morning they began running at 5:00. At11 a.m. they stopped and rested until 5 p.m. Then they ran again until 9:30 in the evening. Each day they ran about 40 miles (64 km). Every day it was the same thing. They got up and ran. They listened to music on their iPods, and they ran and ran.

　　Kevin, Ray, and Charlie needed to eat a lot of food during their trip. Most people need about 2,000 calories of food each day. Kevin, Ray, and Charlie needed between 6,000 and 9,000 calories every day. That"s a lot of food! They also needed to drink a lot of water.

　　The three men had some problems on their trip, and many times they wanted to quit and go home. It was often very hot (140°F/60°C) during the day, and the heat made them sick. Their legs and feet hurt. Sometimes it was very windy, and they couldn"t see. One time they got lost. But they didn"t quit. After 111 days, Kevin, Ray; and Charlie successfully finished their trip across theSaharaDesert. They hugged each other and put their hands in the water of theRed Sea. Then they ran to a hotel to take a long shower.

　　词汇：

　　Stretch / strɛtʃ / v. 延伸，伸展

　　Calorie / "kælərɪ / n. 卡(路里)，小卡，大卡

　　Quit / kwɪt / v. 停止，放

　　注释：

In the middle of the day: the men usually stopped running.

A:Right B:Wrong C:mentioned

“1/3倍频带1KHz的声压级为63dB”是指（）。

A:1KHz频率处的声压级为63dB B:900-1120Hz频率范围内的声压级的和为63dB C:710-1400Hz频带范围内的声压级的和为63dB D:333Hz频率处的声压级为63dB

对于载波选频直放站，带外抑制度要求如下：设f0为滤波器带宽的中心频率，直放站增益为85dB，则f0+400KHZ频率位置的增益衰减应小于（）。

A:30db B:35db C:45db D:50db

当多个不同频率信号同时加在非线性器件上时，由于非线性变换可能产生互调干扰，其中以三阶互调的影响最大，若现有f1，f2两路信号，其大小分别为4KHZ和5KHZ，其产生的三阶互调干扰信号可能为（）.

A:1KHZ B:2KHZ C:3KHZ D:9KHZ

对于宽带直放站，带外抑制度要求如下：设f1为滤波器带宽的下限频率，直放站增益为85dB，则f1-600KHz频率位置的增益衰减应小于多少？（）

A:-35dB B:-40dB C:-50dB D:-60dB