A.5個(gè) B.7個(gè) C.4個(gè) D.8個(gè)
A.459/6 B.4.5% C.0.45% D.0.045%
A.0.1%~0.2% B.0.25%~0.6% C.0.6%~0.7% D.0.8%~1%