单项选择题
A.10~50ng/mlB.100~200ng/mlC.350~600ng/mlD.800~1000ng/ml
A.0.1~1.2ng/mlB.0.6~2.4ng/mlC.1.0~10ng/mlD.2.4~12ng/ml
A.0.1~1.2ng/mlB.0.6~2.4ng/mlC.1.0~2.4ng/mlD.2.0~10ng/ml
A.30~300ng/mlB.100~200ng/mlC.200~500ng/mlD.500~700ng/ml
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