新装（）电梯的层门门扇与门扇之间、门扇与门套、地坎之间的间隙应大于6㎜.
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某月烧结矿总产量为20.8万吨，碱度合格率87.5%，未验率5%。求不合格量是多少？
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。
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.
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