單項(xiàng)選擇題
某加油站當(dāng)日驗(yàn)量,標(biāo)準(zhǔn)計(jì)量罐證書的數(shù)據(jù)為副標(biāo)下0點(diǎn),對(duì)應(yīng)主標(biāo)尺64.6mm處容積V20=50.0000L,計(jì)量頸容積4.386ml/mm,加油機(jī)1#槍發(fā)出50L后副標(biāo)尺下0點(diǎn),在主標(biāo)尺讀數(shù)為40.5mm,在不考慮溫度修正的情況下,該槍的精度為()。
A.0.2%
B.-0.2%
C.0.21%
D.-0.21%