You can change the sound of your music to become more professional by adding ______.
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With the mixer, you can set the volume of each track of sound ______ the other tracks.
We learn that the number of Indian farmers is over 200 times ______.
假定你研究噬菌体φX174 DNA,发现其碱基组成为A,25%;T,36%;G,24%;C,18%。(1)这符合碱基当量规则(chargaffs rule)吗?(2)你如何解释这一结果?(3)该噬菌体是如何复制的?