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20h

20h

20h

20h

1

Surprint of carbon paper in humid environments , where we put 20 h to have build, there would not be able to.

已曝光的碳素纸在一定的潮湿环境下，存放 20h 再予以过版，就会无法进行显影。

3

20h 4 Total number of sectors in the filesystem(or in the partition ).

文件系统的总扇区数（也就是本分区的总扇区数）。

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