ball grade [机] 球等级 ; 球品级
Ball Screw Grade 滚珠丝杆等级
ball mill grade 球磨分级
sanitary grade fixed cleaning ball 产品名称卫生级固定喷雾清洗球
sanitary grade revolving cleaning ball 产品名称卫生级旋转清洗球
sanitray grade retention-free ball valve 产品名称卫生级无滞留液球阀
Catching a fly ball during a baseball game in grade 5.
在棒球比赛5级中接住一个高飞球。
Primary uses for wrot brass are for ball valve stems and balls, and iron valve stems. a forging grade of brass is used in ball valve bodies and pieces.
黄铜的主要用途是球阀阀杆和球体，和铸铁阀门的阀杆。可锻黄铜可用于球阀阀体和断口部件。
The technique can not only increase greatly the thronghput capacity of the plant's ball mills, but also maintain the original grade of concentrate.
该工艺在保证精矿品位的前提下可较大幅度地提高球磨机处理能力。
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