normally closed, Total:7 items.
In the international standard classification, normally closed involves: Shafts and couplings, Petroleum products in general, Power stations in general.
Atmospheric pressure, Normally open normally, Abnormal, Infrared often, obturator volume, normally closed, closed flash point, Obturator, Pore closed, How to close the group, How about obturator, always close, Quasi-normal, Regular, Normal light oil, closed, Chang Yongsheng, Obturator + Pore, Chang Haijun, closed.
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