单项选择题
A.1±0.5mm B.1.5±0.5mm C.1±1.5mm D.1.5±1mm
A.<7mm B.≤7mm C.≥7mm D.>7mm
A.2.0±0.5mm B.1.0±0.5mm C.1.5±0.5mm D.1.5±1.0mm