排气口接头的密封表面的加工质量通常不是问题，但它会影响螺纹。
Machining quality is usually not a problem with the sealing surfaces of outlet connections, but it may impact the threads.
排气口接头的密封表面的加工质量通常不是问题，但它会影响螺纹。
Machining quality is usually not a problem with the sealing surfaces of outlet connections, but it may impact the threads.
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