单项选择题
A.0.5mm B.1mm C.1.5mm D.2mm
A.2100N/s±200N/s B.2200N/s±100N/s C.2400N/s±100N/s D.2400N/s±200N/s
A.0.75% B.1.15% C.1.25% D.1.50%