VRML is a （71） 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（72） (z and time) to the presentation of documents. The applications of VRML are （73）, 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 （74） with VRML. Furthermore, it is componentized, profiled, and extensible, which makes it possible to use X3D in very different （75）, from high-end visualizations to lightweight applications.
In comparison to HTML, VRML adds the next level of interaction, structured graphics, and extra（）(z and time) to the presentation of documents
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21-25 Over the last 25 years, British society has changed a great deal--or at least many parts of it have. In some ways, however, very little has changed, particularly where attitudes are concerned. Ideas about social class--whether a person is "working-class" or "middle-class"--are one area in which changes have been extremely slow. In the past, the working-class tended to be paid less than middle-class people, such as teachers and doctors. As a result of this and also of the fact that workers’ jobs were generally much less secure, distinct differences in life-styles and attitudes came into existence. The typical working man would collect his wages on Friday evening and then, it was widely believed, having given his wife her "housekeeping", would go out and squander the rest on beer and betting. The stereotype A. Life style and occupation. B. Attitude and income. C. Income and job security. D. Job security and hobbies. [判断题]局《服务质量规范》中要求硬卧车棉被放在铺上,距离铺边、靠窗墙壁 5 厘米,软卧车两床被分别成45度角平行摆放于上铺铺上,靠窗被里侧距墙角20厘米,外沿分别与栏杆相齐。
A.正确 B.错误 [判断题]列车在正线区间运行有伤亡人员时，司机可自行移动列车，列车重新投人运营必须有行车调度员的命令。
A.正确 B.错误 [判断题]各级人员有权制止岗位人员的违章操作行为，拒绝违章作业的指令等
A.正确 B.错误 [判断题]电客车月检中需更换受电弓接触滑板时，应同时更换2条滑板。（ ）
A.正确 B.错误 [判断题]《广西电网有限责任公司职业健康管理实施细则》（Q/CSG-GXPG2143001-2020）附录《职业健康危害辨识及风险评估方法》第1.3条规定：组织专业人员核定危害因素辨识结果，确定危害是否存在，必要时现场查看验证。
A.正确 B.错误 [多选题]120.对建设工程质量负责的主体单位有：
A.施工单位 B.检测单位 C.监理单位 D.设计单位 E.建设单位 我来回答: 提交
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