足月妊娠分娩后β-hcG下降至正常的时间（） ["9天","12天","19天","30天","60天"]
葡萄胎清宫术后β-hCG下降至正常的时间（） ["9天","12天","19天","30天","60天"]
自然流产后β-hCG下降至正常的时间（） ["9天","12天","19天","30天","60天"]
葡萄胎完全排空后3个月，hCG仍高于正常范围的是（） ["持续性葡萄胎","再次葡萄胎","侵蚀性葡萄胎","绒癌","胎盘部位滋养细胞肿瘤"]
腹膜后间隙肿瘤与腹膜腔肿瘤的鉴别。
简述腹膜后间隙积液的声像图表现。
