單項選擇題某壓力表刻度為O一100kPa,在50kPa處計量檢定值為49.5kPa,那么在50kPa處儀表的絕對誤差、示值相對誤差、儀表引用誤差分別是()。

A.0.5kPa,0.5%,1%
B.0.5kPa,0.5%,0.5%
C.0.5kPa,1%,1%
D.0.5kPa,1%,0.5%