NO是大气污染物之一,但少量NO在人体内具有扩张血管、增强记忆的功能.NO难溶于水,通常条件下极易与氧气反应.实验室收集NO的装置是( )
A:
B:
C:
D:
I am . Xiaoyong is than me.
______the moment, my parents are ______ my teacher in the office.
板块构造学说认为,几乎全部是海洋的板块是( )