A:曲线A是向NaAlO2溶液中滴入盐酸至过量
B:曲线B是向澄清石灰水中通入CO2至过量
C:曲线C是向含有盐酸的AlCl3溶液中滴入NaOH溶液至过量
D:曲线D是向含有等物质的量的Ca(OH)2、KOH通入CO2至过量
①若△ABC经过平移后得到△A1B1C1,已知点C1的坐标为(4,0),写出顶点A1,B1的坐标
②若△ABC和△A2B2C2关于原点O成中心对称,写出△A2B2C2的各顶点的坐标;
③将△ABC绕着点O按顺时针方向旋转90°得到△A3B3C3,写出△A3B3C3的各顶点的坐标.
How do learning habits influence learning results? It's useful and necessary to discuss learning habits. There is a famous ____ (say) “Good habits lead to good endings”, which shows the importance of habits.
“An apple a day keeps the doctor away.” Also ____ (show) a healthy everyday habit helps to build up our body. Thus, good learning habits can help us gain great learning results, high scores and abundant knowledge ____ (include). At first,learning habits form our ways of thinking and ____(attitude) to the content of our learning.____ ( obvious),a good habit can help us to speed up to reach our destinations. As we can see,developing a good habit is so important ____ I would like to introduce one kind of good learning habits — keep a learning diary every day. We can start the habit by ____ (write) a learning summary and remember to record something ____ (impress) and meaningful. Keep it in mind, and we can gain this good learning habit and benefit from it.
What's ____(much),I find out that I still have some bad learning habits ____ well. I can only concentrate on reading for a short time and I will conquer this problem by spending more effort on concentration practice in future.
I believe that through my efforts,I can gain good learning results by having good habits.