三价

If vaccinal measles vaccine can prevent hives, take a poliomyelitis tervalent mixture vaccine can prevent a poliomyelitis to wait.

如接种疹疫苗能预防疹，服脊髓灰质炎三价混合疫苗能预防痹症等。

At present, trivalent chromium electroplating process has became one of the mostimportant techniques to taking place of the seriously pollutional hexvalent chromiumelectroplating process.

目前，三价铬电镀工艺已经为取代重污染六价铬电镀的最重之一。