A.(6.9±2.9)×108 B.(6.9±2.9)×109 C.(6.9±2.9)×107 D.(6.9±2.9)×106 E.(6.9±2.9)×105
A.0.50~0.65 B.0.55~0.60 C.0.60~0.70 D.0.70~0.75 E.0.75~0.85
A.0.8% B.0.6% C.0.4% D.0.2% E.0.1%