VRML is a（1）for 3D multimedia and shared virtual worlds on

【名词&注释】

交互作用(interaction)、虚拟社区(virtual community)、虚拟现实(virtual reality)、轻量级(lightweight)、严格执行(strict implementation)、操作规程(operating rules)、设计规范(design code)、继续发展(continue to develop)、祖细胞(progenitor cells)、安全规章制度(safety regulation system)

[单选题]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.

A. A

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[单选题]盆式橡胶支座限于在线路坡度小于或等于（）的混凝土梁上使用。

A. A、6‰
B. B、7‰
C. C、8‰
D. D、9‰

[单选题]CD34+、CD19+细胞主要见于（）

A. 全能造血干细胞
B. B淋巴细胞系祖细胞^{(progenitor cells)}
C. T淋巴细胞系祖细胞^{(progenitor cells)}
D. 髓系造血干细胞
E. 粒-单核系祖细胞^{(progenitor cells)}

[多选题]特种设备使用单位的作业人员在作业中应当严格执行特种设备的（）。

A. 操作规程
B. 制造规范
C. 设计规范^{(design code)}
D. 有关安全规章制度^{(safety regulation system)}

[多选题]从特征上而言，物权属于（）。

A. 对人权
B. 对世权
C. 绝对权
D. 请求权
E. 支配权

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