题目内容

Primary amenorrhea is defined as

2021-01-14

A.the absence of menses by 16 years of age in the presence of normal secondary sexual characteristics， or by 14 years of age when there is no visible secondary sexual characteristic development

B.the absence of menses by 14 years of age in the presence of normal secondary sexual chararcteristics， or by 12 years of age when there is no visible secondary sexual characteristic development

C.the absence of menses by 14 years of age in the presence of normal secondary sexual chararcteristics

D.by 14 years of age when there is no visible secondary sexual characteristic de¬velopment

E.the absence of menses by 16 years of age in the presence of normal secondary sexual chararcteristics， or by 12 years of age when there is no visible secondary sexual characteristic development

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