假设它是从第16个字符开始的，下面这个命令就返回第16个字符，这是文件属主名的第一个字符。
Assuming that it begins with the 16th character, the following command returns the 16th character, the first letter of the owner's name.
所有图纸和文件上需给出业主名称(最终用户)，买方工程编码、设备位号及系统名称。
All drawings and documents shall give the name of Client (end user), Purchaser's Work No., Item No. and service of the commodity.
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