

四年级-机械
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Physics
•
4th Grade
•
Hard
ONG SZE YING
FREE Resource
2 Slides • 0 Questions
1
四年级-机械

2
简单机械
1.杠杆 2.滑轮 3.齿轮
4.斜面 5.螺旋 6.尖劈
7.轮轴
四年级-机械

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