The design and implementing technology of a cryogenic refrigeration control system based on PLC of SIMATIC S7-300 is introduced in this paper.是什么意思_The design and implementing technology of a cryogenic refrigeration control system based on PLC of SIMATIC S7-300 is introduced in this paper.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句