【问】我们在建筑材料试验工作中,经常碰到试验数据计算或读数的精确度问题,如砂子筛分试验称量筛余量,要求精确到0.5克。有些试验数据要求精确到0.5%,或精确至0.5公斤等等。为此,经常发生争论。有的同志认为,应该按钢材采用25进位,也有的同志认为,材料试验资料上没有这个规定,所以不能采用。我们也访问了一些单位,有用25进位的,有 [Q] In the test of building materials, we often encounter accuracy problems in the calculation or reading of test data. For example, the sand screening test weighs the remaining amount of the sieve and requires an accuracy of 0.5 g. Some test data requirements are accurate to 0.5%, or to 0.5 kg and so on. For this reason, disputes often occur. Some comrades believe that steel should be used in a 25-round manner, and some comrades believe that there is no such requirement on material test data, so they cannot be adopted. We also visited a number of units, useful 25-round, with