常見(jiàn)例句雙語(yǔ)例句For convenience in application, RA series of fluxes, in which pinic acid is the main active component, were prepared.爲(wèi)了便於使用，還研制了以蒎酸爲(wèi)主要活性組分的RA系列助銲劑。 返回 pinic acid