题目内容
(请给出正确答案)
[单选题]
定级的DVM的误差年变化量应小于或等于()。
A.1/3(a%Ux+%bUm)
B.1/2(a%Ux+%bUm)
C.(a%Ux+%bUm)
D.1/5(a%Ux+%bUm)
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A.1/3(a%Ux+%bUm)
B.1/2(a%Ux+%bUm)
C.(a%Ux+%bUm)
D.1/5(a%Ux+%bUm)
A.1/2~1/4;
B.1/5~1/10;
C.1/3~1/5;
D.1/10~1/20。