肾动脉狭窄的超声诊断标准（）。①狭窄处血流亮度增加，流速加快，Vmax≥180cm／

妇科检查时下列错误的是

A．检查前要充盈膀胱
B．月经期一般不做 * * 检查
C．未婚者一般禁止 * * 检查
D．男医生检查要有第三者在场
E．一套器械只能供一人使用

     This is Tom. He is thirteen. He is from the U.S.A. He is a student. He has a good friend. His name

is Bill. Bill is fifteen. He is from Canada. Bill is tall but Tom is short. They are in the same school, but

they are in different grades. Tom is in Grade One. Bill is in Grade Two. They go to school(上学) at

seven in the morning and go home(回家) at six in the afternoon.

根据短文内容，选择正确的答案。

1. Tom and Bill are ____.

A. sisters

B. brothers

C. teacher and student

D. from different countries(国家)

2. Tom and Bill are in ____.

A. the same grade

B. different grades

C. the same color

D. the same family(家庭)

3. Bill is  ____.

A. 12      

B. 13      

C. 14  

D. 15

4. They go home at ____ in the afternoon.

A. 6:00

B. 7:00

C. 7:30

D. 8:00

5. Tom  is  ____.

A. short

B. tall    

C. strong

D. big

金属切削机床在出厂前、大修理后或质量检查时，为检验机床的质量、加工性质和生产能力需要进行试验。试验一般分为哪两种类型？试简述它们的测试目的及内容。

骨样骨瘤的MRI表现中哪项错误（）

A.肿瘤的未钙化部分在T1W2上呈低到高中等信号T2W1上呈高信号

B.肿瘤的钙化部分在T1W2和T2W1上均呈高信号

C.瘤巢周围骨质硬化在T1W2和T2W1上均呈低信号

D.肿瘤周围的骨髓和软组织呈长T1长T2信号

E.部分肿瘤甚至伴有邻近关节积液和滑膜炎症

天然托帕石的典型包体特征为（）。

A.二相不相混溶液体包体

B.雨点状包体

C.气液二相包体

D.糖浆状包体