1·Sieve diameter is the length of the side of a square sieve opening through which the given particle will just pass .
“筛析粒径”是指一个四方筛孔的边长，某已知的颗粒将恰好通过这筛孔。
2·On the basis of sieve analysis for the formation sand, through the simulation experiments of sand production, the sieve-opening sine of premium screen pipe for sand control was determined.
在分析地层砂粒度分布的基础上，通过室内出砂模拟实验，确定了该油田各油层的防砂筛管挡砂精度。