眼球突出可见于（） A.吐泻 B.肺胀 C.中风 D.眼丹 E.水肿

I love _____________ on trips. [ ]

A. go

B. goes

C. gos

D. to go

关于主动脉瓣狭窄，下述哪些正确（）

A.达到一定程度可出现心绞痛、晕厥和呼吸困难三大症状

B.出现心绞痛的主因是冠状动脉粥样硬化

C.诱导前出现心绞痛则选用硝酸甘油

D.因向心性心肌肥厚，术中心肌保护更重要

E.术中血压过低选用a-受体兴奋剂

根据句意及首字母提示完成单词。

1. Who is the c________ of the Chinese basketball team?  

2. Mr Liu is very funny. she often tells us j________ in class.

3. Please r________ to call me up when you get to Beijing.

4. Mrs.  Green is a little bit heavy. She wants to be t________.

5. Jackie Chan is a very p________ movie star in China. We all love his action movies.

从事商用密码产品的科研、生产和销售以及使用商用密码产品的单位和人员，必须对所接触和掌握的商用密码技术承担_____义务。（）

A.保护

B.保证

C.保质

D.保密

计算题：有一齿轮传动，小齿轮的齿数是20，大齿轮的齿数是80，求其传动比？