It is composed of casing flange, casing cross joint, wellhead valves, tubing hanger, tubing head cross joint and accessories.
这种井口装置由套管法兰、套管大四通、井口阀、油管挂、油管挂体及相关附件组成。
All kinds of cell phone casing, processing accessories.
各种手机外壳，配件加工。
All kinds of cell phone casing, processing accessories.
各种手机外壳，配件加工。
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