照片影像的对比度与射线对比度的比为（）.
A.感光度
B.相对感度
C.平均斜率
D.反差系数
E.宽容度
参考答案：D
电信间室温应保持在( )～( )℃之间；相对湿度应保持在20%～80%，并应有良好的通风。
A．10 B．15 C．25 D．35
Comet Corporation is a capital intensive, growing firm. Comet operates in an inflationary environment and its inventory quantities are stable. Which of the following accounting methods will cause Comet to report a lower price-to-book ratio, all else equalInventory methodDepreciation method（）
A. First-in, First-out Accelerated
B. First-in, First-out Straight-line
C. Last-in, First-out Straight-line
