Dual-head double-screw bolt的意思|示意
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双头双螺钉螺栓
Dual-head double-screw bolt的网络常见释义
双头螺柱 ... 阀座、阀杆 Seat、Stem 双头螺柱 Dual-head double-screw bolt 三、主要性能规范 Main Performance Spcification： ...