判断大隐静脉瓣膜功能者为（）。 A.Buerger试验 B.Trendelenbur

0.83×15的积与15×0.83的积相等，所以表示的意义也相同______．

根据句意及首字母提示填单词，完成句子。

1. Do we have to wear a u______ at school?

2. The students are having an English class in the c______.

3. I have to w______ my clothes on the weekend.

4. I had a f______ with Bob and we didn't speak to each other after that.

5. She didn't a________ in New York in the morning, but in the afternoon.  

票据丧失后可以采取挂失止付、公示催告、普通诉讼等形式进行补救。（）

全关节结核是指（）。

A.关节内积液增多

B.X线片可见骨质破坏

C.血沉明显增快

D.关节疼痛严重

E.病变累及骨、软骨及滑膜