下列哪些不属正常肺纹理影像（）
A.肺纹理增多
B.肺纹理减少
C.肺纹理缺乏
D.肺纹理聚拢
E.下肺纹理比上肺纹理多
参考答案：A, B, C, D
Using Chebyshev's inequality, what is the minimum proportion of observations from a population of 500 that lies within two standard deviations of the mean, regardless of the shape of the distribution（）
A. 75%.
B. 89%.
C. 99%.
—What do you think of the concert
—I really enjoy it. I didn't expect it was () wonderful.
A. as
B. more
C. most
D. very
