The control system has two level control system and two communication network.
整个控制系统由二级控制系统和二层通讯网络构成。
How to use the two-dimensional code technology to control the two-dimensional code security?
不用自主的二维码技术怎么把控二维码的安全？
Adopt two-sided to heat, two-way temperature control, Make temperature more even.
采用上下加温，双温控制，使温度更加均匀。
Adopt two-sided to heat, two-way temperature control, Make temperature more even.
采用上下加温，双温控制，使温度更加均匀。
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