属于卵巢性无排卵的是
A.Kallmann综合征B.Asherman综合征C.Sheehan综合征D.Turner综合征E.Klinefelter综合征
参考答案:D
什么是疏散指示标志?
We can______ about Chinese history from these doumentaries. [ ]
A. learn
B. to learn
C. learns
D. learning