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金属离子指示剂应具备哪些条件?为什么金属离子指示剂使用时要求一定的pH范围。
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如何选择配位掩蔽剂?
Please read the following English poems,guess their Chinese versionand match them with the proper titles.1.Qing Shihuang and Han Wudiwere lacking inliterary grace,And Tang Taizong and Song TaizuHad little poetry in their souls;And Genghis Khan,Proud Son of Heaven for a day,Knew only shooting eagles, bow outstretched. All are past and gone!For truly great men, look to this age alone.2.Withered vine and an old tree with a crow at dusk.Tiny bridge and a family aside a flowing river.Ancient path and a poor horse in the west wind.A heartbroken manis walking towards the weltering sun to theskyline.3. The endless river eastward flows; with its huge waves are gone all those gallant heroes of bygone years.4. Up and down the main streets, I must have run— A thousand times or more in quest of one, Who I have concluded, cannot be found; For, everywhere, no trace of her can be seen, When, all of a sudden, I turned about, That's her, where lanterns are few and far between.5. Westerly winds withered trees up last night. Climbing up the stairs and being lonely on the loft, I overlooked the endless distance.6. Heaven has made us talents; we're not made in vain;A thousand gold coins spent, more will turn up again.7.People have sorrow and joy; they part and meet again. The moon dims or shines; it waxes or wanes. Nothing is perfect, not even in the olden days.We wish each other a long life so as to share the beauty of this graceful moonlight, even though miles apart.8. I would part with you only when mountains had no rocks, rivers had no water, thunders shocked in winter, snow fell in summer, and distinction disappeared between the sky and the earth.9. Cut running water with a sword, it will faster flow; Drink wine to drown your sorrow, it will heavier grow.10. Peach Blossom Pool is a thousand feet deep, yet not so deep,Wang Lun,as your love for me.11. A time will come to ride the wind and cleave the waves; I'll set my cloud-white sail and cross the sea, which raves.12.If love between both sides can last for year, why need they stay together night and day?13. Taking your hand, living to old age together.14. A Young idler,an old beggar15. The dress takes to loosen gradually and I am more and more emaciated, No regretful plying at all, I am rather for her only distressed as I did.16. The silkworm keeps on making silk until death. The candle keeps on tear dropping until being ash.17. We widen our views three hundred miles by ascending one flight of stairs. Exhausting my eyes to a thousand li further, I am ascending one more story of the tower.18.Raising my head, I see the moon so bright; withdrawing my eyes, my nostalgia comes around.A--ButterfliesinLovewithFlowers(Yan Shu)B--The Midautumn Festival Tune:“Prelude to Water Melody”(Su Shi)C ----Snow—to the tune of Qin Yuan Chun（Mao Zedong）D--The Charms of Niannu(Su Shi)E--The Lantern Festival Night - to the tune of Green Jade Table (Xin Qiji)F--Yuefu Poetry(Yuefu Song): A PledgeG--Autumn Thoughts(Ma Zhiyuan)H--Invitation To Wine(Li Bai)I--Farewell To Uncle Yun, The Imperial Libr arian, At The Xie Tiao Pavilion In Xuanzhou (Li Bai)J--The Book of Poetry:BeatingtheDrumK--Hard Is The Road Of The World (Li Bai)L--To Wang Lun-Li BaiM--Fairy Of The Magpie Bridge (Qin Guan)N--ButterfliesinLovewithFlowers（Liu Yong）O--Yuefu Poetry(Yuefu Song): ASonginSlowTimeP--Tranquil Night (Li Bai)Q--AscendingGuanque/StorkTower(Wang Zhihuan)R--Untitled(Li Shangyin)
两个样本率进行比较时，卡方检验的基本公式要求是（）
配对设计的卡方检验什么情况下需要校正公式
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