单项选择题

A.滤尘精度0.01μm、滤油精度0.01ppm
B.滤尘精度0.02μm、滤油精度0.02ppm
C.滤尘精度0.03μm、滤油精度0.03ppm
D.滤尘精度0.04μm、滤油精度0.04ppm