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六、允许误差详细的工程量及单价的选择是允许有误差的。当范围或工作界限不完善时,以通用的单价代替详细的单价,但要尽可能少用。编制预算者要对投资的发展有预测能力,例如电力分包公司的价值(不包括设备)可能占某工业性工厂总投资10～13％,工艺及公用管道可能是6％,在预算的初期用此法可能比用详细计算工作量的方法更实际。
Sixth, the allowable error The detailed engineering quantity and the choice of the unit price is allowed to have the error. When the scope or work boundaries are not perfect, the generic unit price instead of the detailed unit price, but to minimize use. For example, the value of a power subcontracting company (excluding equipment) may account for 10% to 13% of the total investment in an industrial factory and 6% for the process and utility pipe. In the initial stage of the budget This method may be more practical than the method of calculating the amount of work in detail.