prepartory grinding

• 初磨,粗磨,预磨

prepartory grinding的用法和样例：

例句

1. Apply to wet fine, coarse grinding hardness of ore and other materials, particularly applicable to the process of artificial sand-conditioning read modulus.
   适用于湿法细碎，粗磨各种硬度的矿石及其他物料，特别适用于人工造砂过程中调节细读模数。