A.φe>φ B.φe=φ C.φe≥φ D.φe<φ
A.0.2%~0.5% B.0.5%一1.3% C.1.3%~2.0% D.2.O%~3.5%
A.<0.5% B.為0.5%~1.3% C.為1.3%~2.0% D.>2.O%