It is suggested to apply the principle of effective gravity and equivalent pressure head to calculate the rotational speed and ingate area in the processing of grinding ball by centrifugal casting.

在离心铸球工艺中，可应用有效重度和等效压头原理计算转速和内浇口断面积。

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Liberal Democrat Robert Brown said passing new laws might not necessarily be the most effective way of combating the issue, as attacks on public sector workers were already treated with gravity under existing law.

BBC: Labour debate: protecting the worker