置换密码是一种简单的加密技术，采用这项技术将把字母表中的每个字母替换为字母表中的其他字母。
A substitution cypher is a simple encryption technique where every letter of the alphabet is substituted with another letter from the alphabet.
在离心式水泵工作现场只须把原安装真空表的位置换上负压变送器即可进行检测。
On the working spot of centrifugal water pump, the detection can be carried out only by fixing the negative pressure translator in the original position of vacuum meter.
在离心式水泵工作现场只须把原安装真空表的位置换上负压变送器即可进行检测。
On the working spot of centrifugal water pump, the detection can be carried out only by fixing the negative pressure translator in the original position of vacuum meter.
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