Quaterisation
季铵化反应
🗣️ 情景例句
And I talked with Mr. Marchetta. Did York make the offer?
我也和Marchrtta先生谈了。York是否跟你谈那个工作机会？
How much is it by air mail?
航空信要多少钱？
It will be by special invitation only.
我们只邀请特别的客户