下列条件下化学反应速率最大的是[ ] A．20℃，0.1mol/L的盐酸溶液20

肺炎球菌肺炎的铁锈痰最主要的原因是（）。

A.痰内有大量红细胞

B.痰内混有大量肺泡巨噬细胞

C.是纤维蛋白和红细胞结合的产物

D.红细胞破坏后释放含铁血黄素所致

E.以上都不是

什么是10 Mb/s以太网的5—4—3规则什么是10 Mb/s以太网的5—4—3规则

关于水溶性有机碘对比剂在体内的代谢，下列哪项说法是正确的（）。

A.主要经肝、胆排泄

B.肝胆、肾排泄量相同

C.除肝－胆、肾外再无其他排泄途径

D.主要经肾排泄，以肾小球滤过排泄为主

E.以上说法全不对

急性白血病并颅内出血时，护理中应（）。

A.给予绝对卧床休息

B.注意神志及瞳孔变化

C.头部冷敷

D.预防压疮、定时翻身

E.头低脚高卧位

Virtual reality (or VR (1) ) 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 (2) .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 (3) world.As you move your head around,the computer will track your motion and display the right image.VR is the most demanding (4) for computer graphics,requiring hardware and software capable of supporting realtime 3D (5) .

A．form

B．forms

C．format

D．shape