下列哪项检查对诊断渗出性胸膜炎最有价值
A．临床表现
B．X线检查
C．胸腔穿刺液检查
D．结核菌素试验
E．超声检查
参考答案：C
Tom was about to close the window__________his attention was eaught by a bird.
A．when
B．if
C．and
D．till
垂直轴
