问题
问答题 简答题
试述比色分析中，选择滤光片的原则是什么？为什么（举例说明）。
答案
参考答案：
选择滤光片的原则是：滤光片的颜色与有色溶液的颜色成互补色的原则。
因为滤光片的作用在于除去不被有色溶液吸收的光，获得适当波长的单色光，因此选择滤光片的颜色要与溶液的颜色成互补色。
例如：KMnO4溶液呈紫红色，表示它选择性的吸收绿色光，因此应选择绿色光片。
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试述比色分析中，选择滤光片的原则是什么？为什么（举例说明）。
参考答案：
选择滤光片的原则是：滤光片的颜色与有色溶液的颜色成互补色的原则。
因为滤光片的作用在于除去不被有色溶液吸收的光，获得适当波长的单色光，因此选择滤光片的颜色要与溶液的颜色成互补色。
例如：KMnO4溶液呈紫红色，表示它选择性的吸收绿色光，因此应选择绿色光片。
| 完型填空 | |||
Five and a half years ago my father was suddenly rushed to the hospital for an operation.At the time,we had no idea that he was__1__ill.The operation did not go well and he remained__2__.Due to the laws of | |||
| ( )1. A. slightly ( )2. A. uncomfortable ( )3. A. inspired ( )4. A. sitting ( )5. A. dinners ( )6. A. changing ( )7. A. angry ( )8. A. even ( )9. A. catch up with ( )10. A. single ( )11. A. cried ( )12. A. doctor ( )13. A. turn ( )14. A. but ( )15. A. said ( )16. A. face ( )17. A. taught ( )18. A. see ( )19. A. lea rn ( )20. A. choice | B. seriously B. uneasy B. trained B. playing B. doubts B. recovering B. pleased B. still B. adapt to B. alone B. shouted B. manager B. put B. since B. handed B. hair B. promised B. remember B. hesitate B. mistake | C. probably C. unfortunate C. forced C. chatting C. ideas C. returning C. curious C. never C. play jokes on C. negative C. laughed C. stranger C. take C. when C. lent C. heart C. reminded C. describe C. continue C. difference | D. simply D. unconscious D. forbidden D. reading D. operations D. leaving D. foolish D. always D. get away from D. impolite D. complained D. nurse D. try D. until D. sold D. leg D. introduced D. heal D. dream D. decision |
