The paper indicates the defects of the first doorframe of the 1500/300 crusher in the using process.
文章叙述了1500/300破碎机原前门框在使用过程中的缺陷，对前门框频繁更换的原因进行了分析，说明了1500/300破碎机前门框改造的具体方案。
I noticed when I took my first step inside . I bumped my head on the doorframe .
我刚踏进第一步时就领教了，我一头撞在了门框上。
I noticed when I took my first step inside . I bumped my head on the doorframe .
我刚踏进第一步时就领教了，我一头撞在了门框上。
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