旅游拍照发到朋友圈,逛街扫扫二维码,上个陌陌聊聊天,这种便捷的交流方式源于( )
将实数5,π,0,﹣6由小到大用“<”号连起来,可表示为____
3a2﹣2a+4a2﹣7a.
There were __________ many horrible smells _______ I can't stay here more than one minute.