与线阵探头相比,环阵探头的优点是
A.环阵探头无伪像B.环阵探头的声束可全部穿透组织C.环阵探头声束衰减少D.环阵探头在X、Y轴上均聚焦E.环阵探头操作方便
参考答案:D
Her child was crying, but she ___________ him and carried on with her work.
A.knew
B.ignored
C.recognized
D.joined
右心功能不全时常见症状为()
A.呼吸困难
B.咳嗽、咳痰
C.少尿
D.心悸
E.胃肠道症状