单词拼写 Can you help me, please? I can't find my son. He is four years old. His name is Peter. He has a

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单词拼写

Can you help me, please? I can't find my son. He is four years old. His name is Peter. He has a r____face, big black e____ and a small n____His hair is brown. He w____a blue T-shirt and blue pants (裤子). If you find him, please call me a____6383—2458.My name is Mary Brown. Thank you very much.

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round,eyes,nose,wears,at

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在“探究影响滑轮组机械效率的因素”实验中，某实验小组用如图所示的同一滑轮组提升不同钩码的方法，分别做了甲、乙、丙3组实验，实验数据记录如下：

次数	钩码重/N	动滑轮重/N	钩码上升的距离/cm	弹簧测力计的示数/N	弹簧测力计上升的距离/cm	机械效率
1	2	0.8	5	1	15	66.7%
2	4	0.8	5	1.7	15	\
3	6	0.8	5	\	15	\

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