Since the fact that the work condition under the shaft in coal mine is comparatively odiously , electric motor block rate is particularly tall.

由于煤矿井下的工作条件比较恶劣，电动机的故障率特别高。

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Said invention has good effect for preventing coal block from being broken, and its coal block breaking rate is low.

本发明防止煤块破碎效果好，破碎率低，且具有圆形立仓的防堵塞作用。

youdao

Said invention has good effect for preventing coal block from being broken, and its coal block breaking rate is low.

本发明防止煤块破碎效果好，破碎率低，且具有圆形立仓的防堵塞作用。

youdao