Holding other license such as mechanical work, welding, pressure vessel, etc is preferred.

持有别的证书如机械、电焊、压力容器证书是优先的。

youdao

Holding other license such as mechanical work, welding, pressure vessel, etc is preferred.

持有别的证书如机械、电焊、压力容器证书是优先的。

youdao