搜题请搜索小程序“爱下问搜题”
问题 单项选择题

主动脉瓣狭窄三联症是指

A．主动脉瓣区收缩期杂音，呼吸困难，胸痛

B．主动脉瓣区收缩期杂音，主动脉瓣喷射音，主动脉瓣区震额

C．呼吸困难，心绞痛，晕颁

D．呼吸困难，胸痛，晕烦

E．心绞痛，晕颁，主动脉瓣区收缩期杂音

答案

参考答案：C

填空题

用动词be (am,  is,  are)填空。

1. She _____ a teacher. Her name _____ Mary.

2. I _____ a boy. My name _____ Li Ming.

3. Who _____ this girl? She _____ Li Mei.

4. How old ______you? I _____ eleven.

5. What _____ this? It _____ a bird. Its name _____ Polly.

6. David _____ a student. His sister _____ a student, too.

7. These books _____ blue. They _____ English books.

8. Li Lei _____ at school today. He _____ drawing a picture now.

9. Amy and Kay _____ here. They _____ not at home.

10. _____ you teachers? No, we _____ not. We _____ students.

11. My favorite color _____ blue.

12. Tom's brother _____ not in the room.
查看答案
单项选择题

由于加热炉某油嘴燃烧不好产生黑烟时应（）。

A．调整风门

B．调整汽门和油门

C．调整烟道挡板

D．降低处理量
查看答案