The helically wound coil may be movable laterally in the groove between a melt channel open position and a melt channel closed position to open or seal the melt channel.
The technology of precision roll forging by closed die groove of machine driven plough share are researched systematically.
系统研究了机引犁铧闭式型槽精密辊锻技术。
3
The groove adopts a closed and butted U-shaped groove (1) to be embedded in the ground surface around a trunk of the fruit tree so as to protect closely.