判断题 The opportunity study is aimed at providing suggestions for investors of the engineering construction project. Based on the researches into natural resources and market, the opportunity study can seek the most profitable investment opportunity

单项选择题 以下哪项说法是正确的A. 肝血管瘤通常低回声型比较多见B. 肝血管瘤是较为少见的肝脏良性肿瘤C. 肝血管瘤最常见的是肝细胞性血管瘤D. 肝囊肿没有较为完整的包膜组织E. 肝囊肿后方常伴有回声增强的现象

单项选择题