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下列哪一项不属于排泄( )
Many people ________ their friends or family by mobile phone today.
凸透镜的焦距是10cm,把点燃的蜡烛放在距凸透镜15cm处,则蜡烛通过凸透镜成的像是( )
中国古代若有民告官,在秦朝、汉朝、两宋应分别由谁先来授理