Name the CLASS OF LEVER for Baseball Bat. 球棒属于哪种杠杆类?
Third Class Lever
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25
The dam wall is (thinner, thicker) at the bottom compared to the above part because the water pressure effect on the base of the dam is (lower, higher). 水坝的水压
thicker, higher
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25
The densities of materials. Show the highest dense and less dense material from the list. 图表显示材料和其密度。写出最高密度和最低密度的材料。