若某道次轧制力为2000t，轧机刚度为500t/mm，初始辊缝为5.6mm，求轧后钢板厚度。
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东风4B型内燃机车二系悬挂装置主要由四个组合式橡胶弹簧及油压减震器组成。
A. 正确
B. 错误
Which of the following statements are FALSE concerning the defragfs command？（）
A. The defragfs command should not be run against file systems and logical volumes that contain mostly transitory information， such as /tmp.
B. The defragfs command should not be run on a large JFS2 file system when running on a 32-bit kernel.
C. The defragfs command can improve file system performance by increasing the file system’s contiguous free space.
D. The defragfs command can only be run against file systems that are mounted with read-write permissions.
评选优秀员工、温馨先生，举办纪念、节日等活动，是属于BI实施的范围。（）
A. 是
B. 不是
C. 不确定
D. 其他
很多行为金融研究者认为，现实中的套利是受很多条件约束的"有限套利"。（）
A. 正确
B. 错误
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