超声导向穿刺时常选择距皮肤最近区为进针路，且靶标前方有____覆盖，又无____存在。

（）为心包穿刺时常用的进针部位。

超声波有哪些物理特性?与超声诊断有什么关系?

诊断感染性心内膜炎的主要依据是在原有的心脏病基础上，短期内出现易变性杂音_____，_____，_____，_____以及超声心动检查发现心瓣膜的团块回声。

If a boy or a girl has grown up in a home with sharing tasks and decisions，he or she will probably______.

扩张型心肌病超声心动图诊断具有_____，_____，_____和室间隔与左室后壁运动减弱四大特点。

Duty is an act or a course of action that people __________you to take by social customs, law or religion.

Duty is an act or a course of action that people ______you to take by social customs, law or religion.

超声诊断甲状腺腺瘤的依据，除内部回声光点均匀外，还具备有_____。

Project ______is an uncertain event or condition that，if it occurs，has a positive or a negative effect on at least one project objective，such as time，cost，scope，or quality．

It will be a relief over the death of a friend or a relative if the friend or relative dies from ______.

超声波频率是大于_______赫兹。