有助于确定有无心包积液最简单、易行、可靠的方法是（）
A.心电图检查
B.X线胸片
C.心包活检
D.超声心动图
E.血液动力学监测
参考答案：D
用适当的词填空。
1. January is the _________ month of the year.
2. February is the _________ month of the year.
3. December is the _________ month of the year.
4. _________ is the third month of the year.
5. _________ is the fourth month of the year.
6. _________ is the fifth month of the year.
玻璃体液化通常首先从玻璃体______开始。
