课程主题：投石机
课程目标：
1.学习杠杆原理
2.学习绕轴运动
3.构建投石机进行投射
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课程主题：机械钳子
课程目标：
1.学习绕轴运动
2.复习杠杆原理
3.学习异性模块的用法
00:25
00:24
00:23
00:22
00:23
00:26
00:12
00:25
00:24
00:26
00:39
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00:10
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00:24
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00:11
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00:24
00:26