No contingency allowance for random events is subtracted from the supply forecast.

供应量预测并没有排除对各种随机事件的应急空间。

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Realistically, a budget accounting item for contingency allowance should be established whenever a contingency amount was included in the final cost estimate.

在实际操作当中，无论详细的成本估算中是否包括了意外事件，项目预算都应列支一笔应急储备金。

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