copper-gold alloy的用法和樣例：
例句
- The etching liquid etches the gold or gold alloy layer existing between the columns evenly.
該蝕刻液均勻蝕刻柱之間存在的金或金合金層。 - The main problems in determination of gold by the back titration for the excessive FeSO4 with potassium bichromate were discussed and experimented.
對重鉻酸鉀滴定過(guò)量硫酸亞鐵返滴定法測定金合金中金的主要問(wèn)題做了探討和實(shí)驗。
