当超声束进心脏之前和出心脏之后均可见到液性暗区，可以诊断为心包积液。
参考答案：对
The big fire lasted as long as 24 hours _______ it was brought under control.[ ]
A. after
B. before
C. since
D. while
转移支付制度的合理性在哪里？
