[题目]现有一个弹簧测力计(量程足够),一把匀质的、长为l有刻度的、零点位于端点的直尺,一个木块及质量不计的细线.试用这些器材设计一个实验装置,通过一次测量(弹簧测力计只准读一次数),求出木块的质量和尺的质量.要求:(1)画出实验示意图;(2)简要写出实验步骤;(3)写出要测量的 [Topic] There is a spring dynamometer (sufficient range), a uniform, lengthened l, a ruler with a zero point at the endpoint, a wooden block and thin lines of unmatched quality. Try these devices to design a The experimental device, through a measurement (spring dynamometer only read a number of times), to determine the quality of the wooden block and the quality of the rule. Requirements: (1) draws a schematic diagram of the experiment; (2) briefly writes the experimental steps; (3 Write out what to measure