1.等效代替和增量法例1地质队员在高山深谷探矿,利用一种叫浮力秤的轻便仪器就可以精确测出矿石的密度.浮力秤的结构是这样的:它的中部是一密封的空心圆筒,圆筒下端挂着多孔的小篮子,圆筒上端有一根刻有标志线的竖直杆,杆顶装有小盘.因为圆筒是空心的,下面挂的小篮子又较 1. Equivalent Replacement and Incremental Example 1 Geological team members are exploring minerals in high mountains and deep valleys and can accurately measure the density of the ore by using a portable instrument called a buoyancy scale. The structure of the buoyancy weigher is such that its middle is a sealed one. A hollow cylinder with a porous basket hung at the bottom of the cylinder. The upper end of the cylinder has a vertical rod engraved with a marking line. The top of the cylinder is equipped with a small disk. Because the cylinder is hollow, the smaller baskets below are