A.2小時(shí) B.6小時(shí) C.12小時(shí) D.24小時(shí) E.48小時(shí)
A.1.0~0.5g B.0.5~0.1g C.0.1~0.01g D.0.01~0.05g E.<0.005g
A.1~2mg/L B.2~3mg/L C.3~4mg/L D.5~10mg/L E.20~30mg/L