门静脉海绵样变性的声像特点是 ( )
A.门静脉正常结构消失
B.门静脉分布区域呈蜂窝状回声
C.门静脉内栓子回声
D.门静脉蜂窝状内测及门脉血流
E.以上都是
参考答案:E
完成句子。
1. This means ________ (越来越多) birds will disappear.
2. We played tennis ________ (开心) until our teacher told us (回) to school.
3. They ________ (走了很长的路) and got tired ________ (在那天).
4. It is warm in Kunming (一年到头).
按行优先顺序存储下三角矩阵的非零元素,非零元素aij(1≤i≤j≤n)地址计算公式是 ______。