某教室平面为扇形面积减去三角形的面积，扇形的圆心角为60°，布_爱下问搜题

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问题单项选择题

某教室平面为扇形面积减去三角形的面积，扇形的圆心角为60°，布置如图所示：圆弧形墙面的半径为30m，教室中均匀布置格栅荧光灯具，计算中忽略墙体的面积。请回答下列问题，并列出解答过程。若该教室按多媒体室选择光源色温，照明装置统一眩光值和照度标准值，下列哪一项是正确的？（）

A.色温4500K，统一眩光值不大于19，0.75m水平面照度值300lx

B.色温4500K，统一眩光值不大于19，地面照度值300lx

C.色温6500K，统一眩光值不大于22，0.75m水平面照度值500lx

D.色温6500K，统一眩光值不大于22，地面照度值500lx

答案

参考答案：A

完形填空

The new science of spending comes to a surprising conclusion .How we use our money may   as much or more than how much we’ve got it.
Money spent on experiences , rather than material goods,   more happiness.
Imagine that you wake up tomorrow morning to   $1 million under your bed .What would you do   that cash?
The money will probably make you think about one thing    all else---- yourself. A large amount of research reveals that money    our selfish sides. We will     much on what that money can do for us alone. Perhaps you are imagining buying a faster car, or even a new house.
But studies show that goods often fail to deliver      happiness. Fortunately ,our ongoing research     many ways to get more happiness from every dollar you spend .Changing how you spend money can increase your happiness.
But making these      needs to challenge some of our ideas of spending. It’s hard not to     buying a house as a wise investment. But research shows it brings very little happiness. A study in the United States found that homeowners , on average ,were no happier than .
So, working hard to save money for a house might not be such a good idea      it means spending less time with your families and friends.
And dozens of studies show that people get more happiness from buying      than material things. Experimental purchases—such as trips ,concerts and special meals –are more   connected to our sense of self.
And experiences come with one more   . They tend to bring us     to other people , but more often, material things are enjoyed     .So social contacts are important to      mental and physical health.

D．brings along

B．concentrate

C．experiences

填空题

玻义耳一马略特定律是指当气体（）不变时，压力与（）成正比。