Four, and then the (AC) region of the L, N access to the 220V power supply (2.5 of copper core wires), such as the installation position is low, the best grounding wire.
再将变压转换器的（AC）区域的L、N接入220V电源（2.5的铜芯电线），如安装位置较低，最好接上地线。
It is considered that the V-N micro-alloy high carbon wire rods obtain the high strength and toughness mainly due to grain refining and precipitation strengthening.
研究认为钒氮微合金化硬线钢主要通过细晶强化和沉淀析出强化，从而提高钢材的强韧件。
Higher content of nitrogen is benefit for increasing strength and toughness for V-N micro-alloyed hard wire rods steel.
较高的氮含量有利于提高硬线钢钒氮微合金化的强韧化效果。
N recent years, we have to provide users with a more than 30 of welding wire production line.
几年来，我们向用户提供了三十多条焊丝生产线。
N recent years, we have to provide users with a more than 30 of welding wire production line.
几年来，我们向用户提供了三十多条焊丝生产线。
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