Christmas Eve falls on December 25.()
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O Henry’s work was acclaimed as the “Encyclopedia of American life humor.”()
“the world is a stage, men and women merely players” is from Byron’s poem.()
巢式PCR是对靶DNA进行二次扩增,第二次扩增所用的模板为_________,可以_________反应的灵敏度和特异性,常用于靶基因的质和()量_________时。巢式PCR的第一对引物在靶序列上的位置应在第二对引物的_________