一标称值50mm的量块经校准后，确定其长度实际值Z为49.999926mm,且合成标准不确定度为u(l)=36.4nm。则正确的测量结果报告方式有()[2008年真题]
A.l - 49. 999926mm ± 36. 4nm B.l =49. 999926mm, U(I) = 73nm(k = 2) C.l = (49. 99993 ±0. 00008)mm(k =2) D.l=49. 999926mm, U(l) = 8 x 10-5 mm (k =2) E.l =49. 999926mm，u( l) =36. 4nm正确答案CDE
