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【单选题】
下列关于直接测量的不确定度的描述,错误的是
A.
一个完整的测量结果表达应该包括：测量值的真值，不确定度，单位以及置信概率。
B.
测量结果的总不确定度由A类不确定度分量和B类不确定度分量合成。
C.
A类不确定度是使用统计的方法进行的评定。
D.
单次测量的不确定度等于测量的B类不确定度分量。
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