嗜铬细胞瘤的声像图表现,下列不正确的是()。
A.肿瘤边界清晰
B.瘤体大小差别大
C.肿块多为强回声
D.有时位于腹主动脉旁
E.可有坏死液化
参考答案:C
Maria is constantly making efforts, she deserves the goal of entering the key university.
A.achieving
B.to achieve
C.being achieved
D.to be achieve
轴流泵电流值高主要是()。
A、换热器列管堵塞
B、酸浓太低
C、密封水太大