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【简答题】
(12分)某研究性学习小组利用手持技术探究强碱和不同的酸中和反应的过程如下: (1)实验步骤: ①分别配制浓度均为0.1mol·L -1 的NaOH、HC1、CH 3 C00H、H 3 PO 4 溶液备用。配制过程中用到的玻璃仪器有烧杯、容量瓶、玻璃棒、细口瓶、____、____。 ②在锥形瓶中加入10mL0.1 mol.L -1 的HC1,在25.00mL____(填“酸式”、“碱式”)滴定管中加入0.1 mol.L -1 的NaOH,连接数据采集器和pH传感器。 ③向锥形瓶中滴入NaOH,接近估算的NaOH用量附近时,减慢滴加速度,等读数稳定后,再滴下一滴NaOH。 ④存储计算机绘制的pH变化图。用0.1 mol·L -1 的CH 3 C00H、H 3 P0 4 溶液代替HC1重复上述②~④的操作。 (2)结果分析:20℃时NaOH分别滴定HC1、CH 3 C00H、H 3 P0 4 的pH变化曲线如下。 根据上述曲线回答下列问题: ①20℃时,三种酸从强到弱的顺序是 ; ②滴定开始后醋酸曲线变化比盐酸快的原因是 ; ③醋酸恰好中和时pH≈8的原因是 ; ④你认为前述的步骤中,NaOH滴定磷酸是否可行? (填“可行”、“不可行”)。
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【单选题】Which can be TRUE according to this passage?
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All the children in the restaurant from Amsterdam
B.
If you don't order a meal a month ahead of time,you will get no food in the city.
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【单选题】Which can be TRUE according to this passage?
A.
All the children in the restaurant from Amsterdam.
B.
If you don't order a meal a month ahead of time, you will get no food in the city.
C.
Everybody likes the Restaurant, so it is often filled with customers.
D.
The restaurant open only on weekdays.
【单选题】在Word中,下列说法错误的是:( )。
A.
Word中页眉的奇偶页可以不同。
B.
Word的查找替换功能可以查找和替换文本中的格式。
C.
分节符不能在普通视图中显示。
D.
Word中文字和表格可以互相转化。
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rather than               
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分节符不能在普通视图中显示
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Word中文字和表格可以互相转化
C.
Word的查找替换功能可以查找和替换文本中的格式
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