生产经营单位主要负责人在本单位发生重大生产安全事故时，不立即组织抢救或在事故调查处理

(4.5分)  10g石灰石与100g盐酸恰好完全反应，生成CO₂质量为2.2g，求：

(1)石灰石中CaCO₃的质量分数；

(2)反应后所得溶液中溶质质量分数是多少？

《水力发电厂计算机监控系统设计规范》规定：大型水电厂的冗余网络的自愈时间或双网之间的切换时间应不大于（）。

A.0.5s；

B.1s；

C.0.2s。

生命神圣论在现代社会中日益显示出的不足之处是（）

A.影响人口的素质

B.影响人口的数量

C.影响计划生育开展

D.影响救死扶伤

轮状病毒感染后主要侵犯（）

A.十二指肠

B.回肠

C.升结肠

D.空肠

E.乙状结肠

Virtual reality (or VR (65) is kind of a buzzword these days in computer graphics.VR is artificial reality created by a computer that is so enveloping that it is perceived by the mind as being truly real.VR exists in many (66) .A traditional view of virtual reality uses headsets and data gloves.The headset serves as the eyes and ears to your virtual world,projecting sights and sounds generated by the computer.The data glove becomes your hand,enabling you to interact with this (67) world.As you move your head around,the computer will track your motion and display the right image.VR is the most demanding (68) for computer graphics,requiring hardware and software capable of supporting realtime 3D (69) .

66（）

A.form 

B.forms 

C.format 

D.shape