| http://etasmt.com:9060/te_news_bulletin/2020-11-20/20761.chtml
. The welding effect of a printed board must be checked. 5. Whether the soldering is sufficient, whether the surface of the solder joint is smooth, whether the solder joint shape is half-moon shape, the condition of tin balls and residue, the condition of
| Sm | t | net |
| 1 |
