单项选择题
A.4mm±2mm B.5mm±1mm C.6mm±1mm D.6mm±2mm
A.2~5mm B.2~8mm C.3~5mm D.3~8mm
A.500N/s±50N/s B.1000N/s±100N/s C.2400N/s±200N/s D.2500N/s±250N/s