有些开放型试题有多种答案,但不同的答案所得的分数是不同的.下面这道实验设计题就是一例.例小明想测量一枚合金戒指(约10g 左右)的密度,来到实验室,物理老师拿给他以下器材:250cm~3、100cm~3、50cm~3的量筒各一个,量程为5N、最小刻度值为0.2N 的弹簧测力计一个,最小砝码为1g、标尺的最小刻度为20mg 的 Some open questions have multiple answers, but the scores for different answers are different. The following experimental design question is an example. Xiaoming wants to measure the density of an alloy ring (about 10g or so) and comes to the laboratory. The physics teacher gave him the following equipment: one measuring cylinder with 250cm~3, 100cm~3, 50cm~3, and one spring dynamometer with a measuring range of 5N and a minimum scale of 0.2N. The minimum weight is 1g and the minimum of the scale The scale is 20mg