You are working in a country where it is customary to exchange gifts between contactor and customer.
你正在工作的国家有一个风俗习惯，即在承包商和客户之间交换礼物。
Method The automatic ventilation and gas exchange system consisted of 2 electronic modulators, alternating current contactor, 1 switch, 1 oxygen meter and some seamless steel tubes.
方法自动通风换气系统由2个电动调节阀、1个交流接触器、1个开关、1台测氧仪、少量无缝钢管组成。
It is big to exchange exactly the contactor work noise again, it is many to consume the electricity, and the coil is easily burnt out.
再就是交流接触器工作噪声大，耗电多，线圈易烧坏等等。
It is big to exchange exactly the contactor work noise again, it is many to consume the electricity, and the coil is easily burnt out.
再就是交流接触器工作噪声大，耗电多，线圈易烧坏等等。
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