Linking method: Connect the electric needleinstrument of plus or minus pole respectively on the needle handle, and exchange poles every time.
连接方法：将电针仪的正负极分别接在针柄上，每次将正负极交换连接。
2
One-time profiles, safety standards, prevent color and color embellish, increase blood backflow using life, make needleinstrument more stable pressure more powerful, transmission.
一次性型材，安全标准，防止色料及血液回流，增加彩润仪使用寿命，令针压更稳定，传动更有力。
3
Needle valve: it is an important instrument measuring piping system components, mainly cut-off valve and ball valve, its purpose is to open or cut off access by pipeline.