pre-crushing chamber 预破碎室
pre-crushing and grinding system 预破碎粉磨系统
revamp of pre-crushing system 预粉碎系统的改造
Pre-creasing wheel to prevents crushing board.
预压传送，防止纸板压破现象。
Regarding the collection of municipal domestic waste, relevant systems should be established to professionalize waste transportation and to pre-process the sewage produced by crushing kitchen waste.
在城市生活垃圾收集方面应制定相关制度推行垃圾运输的专业化和厨余垃圾粉碎的污水预先处理。
The test work indicated the probability of a pre-concentration stage using a screening, dense media separation or coarse-ore jigging after crushing and screening.
这个试验工作表明可以通过在进行粉碎和过滤之后对矿石进行再过滤，重阶选矿或者初步汰选的这样一种预浓缩阶段的实现可能性。
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