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)、氯乙烯(vinyl chloride)、虚拟现实(virtual reality)、轻量级(lightweight)、渐进性(gradualness)、关节活动范围、继续发展(continue to develop)、具体情况(concrete conditions)、潜在致癌物(potential carcinogen)

[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. C

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学习资料：

[单选题]患者，女，53岁，左上肢疼痛9个月，咳嗽时加重，开始左上、下肢渐进性无力，右下肢麻木逐渐向上扩展，左上肢下运动神经元性瘫，肌力4级，左下肢呈上运动神经元性瘫，肌力3～4级，左上肢深感觉障碍，右T1水平以下痛、温觉缺失。病变部位在（）

A. 左侧颈膨大及上胸髓
B. 左侧颈膨大
C. 双侧颈膨大
D. 右侧颈膨大及上胸髓
E. 右侧颈膨大

[单选题]一腰段脊髓损伤患者，双下肢伸膝力量差，对他进行股四头肌徒手肌力测定。

A. B

[单选题]下列物质中，属于潜在致癌物^{(potential carcinogen)}的是()。

A. 铜
B. 石棉
C. 氯乙烯
D. 锌

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