试题1 现有一只量杯、一只溢水杯、几只小烧杯和清水,请用这些器材测出一只玻璃球的密度,要求写出:(1)主要操作步骤和测量的物理量;(2)根据测量得的物理量,写出玻璃球密度的表达式:_____(98年盐城)试题2 给你一只量筒、一只烧杯、一根足够长的细线、一个水槽及足量的水,请利用上述全部器材测出新鲜土豆的密度(土豆样品已取好,大小合适,其密度比水大,且不再吸水). Question 1 There is a measuring cup, a spill cup, a few small beakers, and fresh water. Use these devices to measure the density of a glass ball. Write out: (1) the main operation steps and the measured physical quantities; (2) Based on the measured physical quantity, write an expression for the glass ball density: _____ (Yancheng 98) Question 2 Give you a measuring cylinder, a beaker, a long enough thin line, a sink, and a sufficient amount of water. Please Using all the above equipment to measure the density of fresh potatoes (potato samples have been taken, the size is appropriate, the density is greater than water, and no longer absorb water).