单项选择题
A.1/400 B.1/350 C.1/300 D.1/270
A.1/230B.1/250C.1/270D.1/300
A.1/n B.% C.高风险 D.低风险
A.AFP+Freeβ-HCG B.HCG+uE3 C.AFP+uE3 D.uE3+lnh-A
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