A:外国公使进驻北京
B:领事裁判权
C:中英双方协定关税
D:片面最惠国待遇
常温下,碘与镁化合时速率很慢。若滴入几滴水,则反应剧烈且形成美丽的紫色烟,此时水的作用是( )
Tom wants to be a singer and he singing lessons to do it.
实数﹣6的倒数是( )