研制了一种常温锌系磷化工艺。

A zinc-series phosphating process at room temperature was developed.

youdao

研制了一种新型低温锌系磷化液。

A new type phosphating solution of zinc series at low temperature was prepared.

youdao

研制了一种新型低温锌系磷化液。

A new type phosphating solution of zinc series at low temperature was prepared.

youdao