提示已经排卵的超声表现有:( )① 主卵泡消失;② 主卵泡缩小,内壁塌陷;③ 缩小的主卵泡内有细弱光点;④ 50%以上病人有道格拉斯窝积液
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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