2道初3英语改错题

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• 英语翻译Figure 1:The conduction system of the heart 2.Figure 2:Experimental setup.Refer to Figure 4 for a zoomed in picture of the recording region.Figure 3:Pulse-echo of the 540kHz transducer off a flat air/water interface
• 一道初中的二次函数作业.已知函数y=f(x)在0≤x≤6上有意义。满足y=f(x)在0≤x≤3时是一次函数，在3≤x≤6时是二次函数，且f（x）≤f(5)=3,f(6)=2,求f（x）的表达式。
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• 10道判断题1同种元素组成的物质叫单质,不同种元素组成的物质叫化合物( )2纯净物是由同种元素组成的,混合物肯定是由两种以上元素组成的( )3元素可以以单质状态存在,也可以以化合物状态存在( )4含有氧元素的化合物是氧化物( )5由两种或两种以上的元素组成的纯净物是化合物( )6由同种分子构成的物质一定是纯净物( )7只含有一种元素的物质不一定是单质( )8化合反应的生成物中不可能有单质,分解反应的生成物中不会有化合物( )9由氧元素和另一种元素组成的化合物叫氧化物.水中含有氧元素,所以它是氧化物( )10由不同种元素组成的物质不一定是化合物( )
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