问题
问答题 简答题
什么叫吸收曲线，它有何意义？
答案
参考答案：
使不同波长的光通过某一固定浓度的有色溶液，然后测量每一波长下相应的吸光度。以波长为横坐标，吸光度为纵坐标作曲线，该曲线称为吸收曲线。吸收曲线描述了物质对不同波长光的吸收能力，吸收曲线是光度分析中选择波长的重要依据。通常选波长最大的单色光进行光度分析，以提高分析灵敏度。
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什么叫吸收曲线，它有何意义？
参考答案：
使不同波长的光通过某一固定浓度的有色溶液，然后测量每一波长下相应的吸光度。以波长为横坐标，吸光度为纵坐标作曲线，该曲线称为吸收曲线。吸收曲线描述了物质对不同波长光的吸收能力，吸收曲线是光度分析中选择波长的重要依据。通常选波长最大的单色光进行光度分析，以提高分析灵敏度。
| 阅读理解。 根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。 | |
| 1 It has been used as a product full of nutrition. Our bodies need it for their development and also to help them to recover after a disease. The microelement (微量元素) content of honey is similar to that of our blood. 2 In honey, the percentage of vitamins and minerals differs according to the kind of nectar (花蜜) used by the bees and the quality of the soil where the plants grow. 3 The latter is the most valuable in its healing (治疗) effects. 4 Put one teaspoonful of honey in a glass of milk before going to bed and you will certainly have sweet dreams that night. If you feel sick because you have eaten too much one day, or you have a stomachache, then their solution is a glass of water with honey and lemon. Moreover, a sore throat is not a problem any more if you have a cup of tea with honey. Singers use honey when they have problems with their voices or before a concert when they really feel exhausted. 5 , they use them for their hair, nails and bodies. | |
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