胸腔闭式引流的适应证（）。
A.胸腔积血
B.胸腔积气
C.胸腔积液
D.单纯性肋骨骨折
E.心包填塞
参考答案：A, B, C
80. Materialism is to idealism just as truth is opposed to falsehood.
A．against
B．oppose
C．opposite
D．Opposition
信道带宽的单位是______。
