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，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

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：

They sometimes felt sick because it was so hot.

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

患儿，男性，7岁，下恒切牙、上恒中切牙萌出，无拥挤，其中左上中切牙为舌侧错位，反，反覆中度，余乳牙健康，颌骨关系协调。应采取的处理方法是（）

A:下颌联冠式斜面导板解决个别牙反 B:咬撬法解决个别牙反 C:上颌斜面导板解决个别牙反 D:调磨法解决个别牙反 E:上颌活动矫治器解决个别牙反