单项选择题
A.约450g B.约700g C.约370g D.约500g E.约600g
A.<5μg/L B.<4μg/L C.5～6μg/L D.<3μg/L E.>3μg/L
A.>100ng/L B.<100ng/L C.200～800ng/L D.>200ng/L E.>150ng/L