The initial stage of the adoption of the submerged tank with immersion method, etching fpwb wire width, precision required is not high, may be in the form of the device.

• 初始阶段拔取浸入式槽边浸泡办法，蚀刻导线阔的印制电路不活，精度给求不矮，是可拔取的摆撤布局步地。