例1给你一架无砝码但已调节好的等臂天平、一个量程适当的量杯、一根滴管、一根细绳、一些细沙和适量的水,请你测出一块小矿石的密度.思路:由于本题缺少砝码,显然无法直接测量出小矿石的质量,要注意的是题中给出的是等臂天平,这就为我们测小矿石的质量若隐若现地指出了测小矿石质量的方法,可想法利用该天平找到与小矿石等质量的 Example 1 gives you a weight-free but well-regulated isobar balance, an appropriately sized measuring cup, a dropper, a string, a few fine sand and the right amount of water, you measure a small ore Density. Ideas: As the problem of lack of weight, apparently can not directly measure the quality of small ore, it should be noted that the problem is given arm balance, which we measure the quality of small ore looming to point out the small ore Quality methods can be thought of using the balance to find quality with small ores