A:升高温度
B:增大压强
C:使用催化剂
D:增大反应物浓度
Which subject is _____ , English, math or Chinese?
写出下列词语的近义词。
激动——____ 焦急——____
你能告诉我4.20万精确到什么位吗?( )
Mrs Lin advised the students ______ with friends online and said it was a waste of time.