下列何种变化属于晚期煤矽肺的典型表现（）。
A.煤斑
B.灶周肺气肿
C.煤矽结节
D.弥漫性纤维化
E.大块纤维化
参考答案：E
I was most favorably struck by the assurance with which the boy answered all my questions.()
A. insurance
B. confidence
C. reluctance
D. independence
中心静脉压可反映什么？
