This paper discusses the key problems in the design of hydraulic control system of concrete agitating lorry.

这篇论文探讨混凝土搅拌输送车液压控制系统设计中的关键问题。

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The inquest heard Mr Balkwell had been working in a lorry which had broken down - and was using a drill to try to remove the concrete inside when he became trapped.

BBC: Les Balkwell