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试述胃镜检查的适应证、禁忌证。

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“他奶奶做事很细致”这句话中包含（）个语素。

VRML is a（1）for 3D multimedia and shared virtual worlds on the WWW.In comparison to HTML, VRML adds the next level of interaction,structured graphics,andextra（2）（z and time）to the presentation of documents.The applications of VRMLare（3）,ranging from simple business graphics to entertaining WWW page graphics, manufacturing,scientific,entertainment,and educational applications,and 3D shared virtual worlds and communities. X3D is the name under wluch the development of VRML is continueD.X3D is based on XML andis backwards（4）with VRML.Furthermore,it is componentized,profiled, and extensible,which makes it possible to use X3D in very different（5）,from high-end visualizations to lightweight applications.空白（1）处应选择（）

A. link
B. format
C. structure
D. procedure

CPD-A（枸橼酸钠、磷酸盐、葡萄糖一腺嘌呤）全血保存有效期为（）

A. 10天
B. 21天
C. 28天
D. 30天
E. 35天

中国历史上的“六朝古都”指的是今天的哪座城市（）。