A.0.3~0.5% B.0.5~0.7% C.0.5%~1.0% D.1.0%~1.5%
A.2個(gè) B.3個(gè) C.4個(gè) D.5個(gè)
A.不大于45% B.不大于40% C.不大于35% D.不大于30%