打开外罩2，依次将残存在各号筛内的砂粒倒在白色的腊光纸上，再倒入玻璃皿

Open the outer cover 2, and pour the remaining sand particles in each sieve on the white wax paper, then pour them into a glass dish, and weigh them with a balance (accurate to 0.1 g, and the cut-promoting test to 0.01 g). If there are sand particles embedded in the reed, do not hit the standard sieve, but gently brush it with a brush.

Open the cover 2, in turn, the remaining sand particles in each sieve poured on white wax paper, and then poured into the glass dish, weighing with balance (accurate to 0.1 grams, to 0.01 grams of cutting test). 筘, such as embedded in the sand particles, do not tap the standard sieve, apply a brush gently brushed under.

Open the outer cover 2, pour the residual sand particles in each sieve onto the white waxed paper in turn, then pour them into the glass dish, and weigh them with a balance (accurate to 0.1g, and the cutting ability test to 0.01g). If there are sand grains embedded in the reed, do not knock the standard sieve, and brush it gently with a brush.<br>