It seems like some of them apply to mechanical, electrical and system engineering.
似乎有一些观点是适用于机械，电子和系统工程的。
Mechanical system was divided into simple engineering system and complex engineering system.
将机械系统分为简单工程系统和复杂工程系统。
Mechanical system was divided into simple engineering system and complex engineering system.
将机械系统分为简单工程系统和复杂工程系统。
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