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$1,000
觀察水平面的物理意義 支架及固定鐵夾一個, 透明水槽(20×20×20)cm一個, 方形浮體及銅錘各一個。
To observe the level. Consists of a brass cone, a square wooden float, 200 × 200 × 200mm plastic tank and a steel stand.