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

【名词&注释】

剖宫产手术、交互作用(interaction)、预防性应用抗生素(preventive use of antibiotics)、虚拟社区(virtual community)、虚拟现实(virtual reality)、剖宫产术(cesarean section)、轻量级(lightweight)、娱乐性(entertainment)、继续发展(continue to develop)

[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, and extra（2）（z and time） to the presentation of documents. The applications of VRML are（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 which the development of VRML is continued. X3D is based on XML and is 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. D

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学习资料：

[单选题]患者女性，36岁。妊娠合并高血压，准备实施剖宫产术。为预防感染，给予抗生素的最佳时间是（）

A. 术前1天
B. 术前30～60分钟
C. 脐带钳夹后
D. 术后即给
E. 术前1小时和术后

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