发生碱-集反应必须具备以下三个条件:一是(),二是(),三是()。
参考答案:混凝土中的集料具有活性,混凝土中含有一定量的可溶碱,有一定的湿度
俗话说“一山难容二虎”,原因是( )
A.两只老虎会大家
B.老虎爱孤独
C.老虎原本数量就少
D.受食物的限制
- You were _____ about Jane. She really wanted to help you.
- Sorry, I thought she wanted to laugh at me as usual.[ ]
A. mistaken
B. thankful
C. wrong
D. straightforward