不定项选择如图所示，重物P放在粗糙的水平木板OM上当水平木板绕O点缓慢抬高，在重

如图所示，电源电压保持不变，当闭合开关S，滑动变阻器的滑片P向右移动的过程中，下列说法中正确的是

A．电压表V₁的示数增大，电压表V₂的示数减小

B．电压表V₁示数与电流表示数的比值变小

C．电压表V₁减小的示数小于电压表V₂增大的示数

D．电阻R₁和R₂消耗的功率的变化量一定相等

对利用工作之便骗取麻醉药品的直接责任人，由其所在单位给予：

A．扣发奖金

B．批评教育

C．行政处分

D．行政处罚

E．调离岗位

圈形卡环适用于

A．游离缺失的末端基牙
B．过长牙
C．下(颌)尖牙
D．孤立并向近中颊(舌)侧倾斜的最后磨牙
E．前后均有缺隙的孤立后牙

DOM is a platform and language - (66) API that allows programs and scripts to dynamically access and update the content, structure and style of WWW documents (currently, definitions for HTML and XML documents are part of the specification). The document can be further processed and the results of that processing can be incorporated back into the presented (67) DOM is a (68) -based API to documents, which requires the whole document to be represented in (69) while processing it. A simpler alternative to DOM is the event - based SAX, which can be used to process very large (70) documents that do not fit into the memory available for processing.

A．document

B．processor

C．disc

D．memory

某工地需要大量焊接铁件，一时找不到人，经过培训无证的电焊工刘某说自己能烧电焊，领导就让刘某在工地临时焊接铁件，半天后刘某感到眼睛不适，第二天眼睛肿大，经医院检查被电焊灼伤。

请分析事故原因。

没戴安全防护镜。