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问题 选择题

对密度定义式ρ=m/V的下列几种理解中，正确的是[ ]

A．密度与物体的质量成正比

B．密度与物体的体积成反比

C．密度与物体的体积成正比

D．密度是物质本身的一种特性，与物体的质量和体积无关

答案

答案：D

多项选择题

活化给煤机运行中应注意（）。

A、检查电源电压；

B、电压波动不宜过大；

C、落煤口不得有堵塞；

D、是否有漏煤现象。
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单项选择题

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) .

69（）

A.image 

B.Figure 

C.Logo 

D.graphics
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