磷青铜:C52400 C53400 C54400 C5010
C5191 ,C5210,磷..
QSn6.5-0.1 ,C5..
QSn8-0.3, QSn6..
QSn7-0.2 QSi3-..
磷青铜:C52400 C53..
磷铜带C5111 C5102..