水泡状胎块又称葡萄胎,其声像图特征是:( )① 子宫大于孕周;② 宫腔内充满大小不等的液性暗区,间以强度不等的高回声,呈蜂窝状改变;③ 通常宫内不能发现胎儿、胎盘;④ 宫旁有时可见囊性肿块
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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