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问题描述：

[多选] 扩增曲线是否良好的指标：
A．曲线拐点清楚，特别是低浓度样本扩增曲线指数期明显，扩增曲线整体平行性好，曲线成型，荧光信号强度高。 B．曲线指数期斜率与扩增效率成正比，斜率越大扩增效率越高。 C．标准的基线平直，无明显的上扬趋势。 D．各管的扩增曲线平行性好，表明各反应管的扩增效率相近。
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BWhat is it that makes us different from machines？ We have created AI programs that can do many of the same things we can． There are software（软件） programs that can play chess， drive cars． and solve difficult math problems． But what about creative works？ Most art， music and poetry is inspired by emotion（情感）． And yet， we have indeed created AI that can produce creative works． In October 2018， famous auction（拍卖） house Christie’s auctioned off a painting named portrait of Edmond． The painting is not very famous， but it sold for $432，500（3 million yuan）! What made it so special？ The fact is that it was painted by an AI program written by Obvious， a group of artists in Paris， according to Artnet News． AI has entered the world of poetry as well． In April 2018， Chinese and Japanese researchers wrote an AI program that uses images（图像） to write poems． The AI looks at colors and shapes in an image and uses this information to write a poem． 500 human judges（评委） were asked whether they could tell if the poems were written by a human or a computer， 40% of the judges mistakenly thought the poems were written by a human， according to MIT Technology Review． But if AI can learn to create works of art like this， what place do humans have in the creative world？ The difference is that true art is almost always an expression of emotion - something that AI is still unable to feel． 4． Which of these activities requires creativity（创造力）？
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