... squareness gauge 垂直度测量器 square-opening sieve 方孔筛 square-shaped cap 四角帽 ...
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square opening sieve 方孔筛
square-mesh sieve square-opening sieve 方孔筛
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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。
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