从医学角度讲,女性的最佳生育年龄为()岁。
A、18~24岁
B、20~24岁
C、25~30岁
D、30岁以上
参考答案:C
It said the country's confirmed H7N9 cases were isolated and there has been no______ of human-to-human transmission.
A.mark
B.symbol
C.sign
D.signal
其临床分期是
A.Ⅰa期
B.Ⅰb期
C.Ⅱa期
D.Ⅱb期
E.Ⅲa期