题目内容

以下关于储金球的设计描述不正确的是：

A. 储金球是位于铸道底部的圆球。
B. 储金球的直径要大于铸道的直径。
C. 储金球应放在铸圈的中心区域。
D. 储金球应和熔模同时放在铸圈的顶1/3或2/5
E. 储金球的设置可补偿铸造的体积收缩

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