单项选择题
A.φ45mm×h25mm B.φ45mm×h12mm C.φ25mm×h20mM D.φ40mm×h25mm
A.62.94% B.77.76% C.63.58% D.61.94%
A.1±0.1 B.1±0.01 C.1±0.001 D.1±0.05