[单选题]
( )由于不能分清材料消耗的性质,因而不能作为确定材料净用量定额和材料损定额的依据,只能作为编制定额的辅助性方法使用。
A .现场技术测定法
B .实验室试验法
C .现场统计法
D .理论计算法
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