An important feature of an MES upgrade is that the systems serial number does not change.
MES升级的一个重要特性是不改变系统序列号。
The seal is either stamped smooth or in a corrugated pattern and may feature a serial number or code.
密封采用光滑压纹或者采用波纹压纹，并且可以压印序列号或者代码。
The seal is either stamped smooth or in a corrugated pattern and may feature a serial number or code.
密封采用光滑压纹或者采用波纹压纹，并且可以压印序列号或者代码。
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