“今天星期二吗?”
“不是”
—____ it ____today?
—No, it ____.
用化学用语填空
(1)2个氮原子____ (2)镁离子____
(3)硝酸中氮元素的化合价____ (4)发酵粉中的小苏打 ____ .
The discussion is just meant to ____ (评估)the strengths and weaknesses of other players