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问题 问答题 简答题

何为显色指数？常用灯种的显色指数作对比，显色指数低产生的结果是什么？举例显色指数较高灯、显色指数较低灯对同一物体在不同显色指数下看到的结果是什么？

答案

参考答案：显色指数即衡量光源显现实照物体真实颜色能力的参数。

显色指数高（0-100）的光源对颜色的再现越接近自然原色。

显色指数低导致颜色失真。以下是常用灯种的显色指数：

白炽灯：>95。

管型荧光灯：65-80。

金卤灯：70-90。

高压钠灯：25-50。

三基色稀土荧光灯：85。

单项选择题

0.55g

A．成囊材料
B．增塑剂
C．遮光剂
D．防腐剂
E．增稠剂
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单项选择题

All her life, my mother wanted busy children. It was very important that her house should remain at all times clean and tidy.
You could turn your back for a moment in my mother’s house, leave a half written letter on the dining table, a magazine open on the chair, and turn around to find that my mother had "put it back where it belonged," as she explained. My wife, on one of her first visits to my mother’s house, placed a packet of biscuits on an end table and went to the kitchen to fetch a drink. When she returned, she found the packet had been removed. Confused, she set down her drink and went back to the kitchen for more biscuits, only to return to find that her drink had disappeared. Up to then she had guessed that everyone in my family held onto their drinks so as not to make water rings on the end tables. Now she knows better.
These disappearances had a confusing effect on our family. We were all inclined to forgetfulness, and it was common for one of us, upon returning from the bathroom, to find the every sign of his work in progress had disappeared suddenly. "Do you remember what I was doing" was a question frequently asked, but rarely answered.
Now my sister has developed a secondhand love of clean windows, and my brother does the cleaning in his house, perhaps to avoid having to be the one to lift his feet. I try not to think about it too much, but I have at this later time started to dust the furniture once a week.

Which of the following is TRUE about my mother

A．She enjoyed removing others’ drinks.
B．She became more and more forgetful.
C．She preferred to do everything by herself.
D．She wanted to keep her house in good order.
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