单项选择题
A.25~55mm B.35~65mm C.35~75mm D.40~75mm
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