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问题 填空题

以氯化钾和硝酸钠为原料制备硝酸钾的工艺流程如下：

根据所提供的溶解度曲线，回答下列问题：

（1）20℃时饱和硝酸钠溶液中溶质的质量分数是_________（精确到0.1%）．

（2）为了加速固体溶解，可采取的措施有_________．

（3）实验室进行蒸发浓缩操作时，将蒸发皿置于铁圈上，用酒精灯加热．取用蒸发皿应使用_________（填仪器的名称），为了防止液滴飞溅，进行的操作是_________．

（4）滤液1中含的离子是_________．

答案

（1）46.5%

（2）加热、搅拌、研细颗粒

（3）坩埚钳 ； 用玻璃棒不断搅拌滤液

（4）K+、NO3﹣、Na+、Cl﹣

翻译题

阅读下面短文，将文中划线部分译成汉语或英语。

    Food is very important. Everyone needs to eat well if he or she wants to have a strong body. 1 Our minds

also need a kind of food. This kind of food is knowledge. We begin to get knowledge even we are very young.

2 孩子们对周围的一切都感兴趣.They learn something when they are watching and listening. When they are

getting older, they begin to read storybooks, science books and anything they like. 3 When they find something

new, they love to ask questions and try to find out the answers.

   4 获取知识的最佳方法是什么呢? If we learn by ourselves, we will get the most knowledge. If we are

always getting answers from others and do not ask why, we will never learn well. 5 If we study in the right

way, we will learn more and understand better.

1                                                                                              

2                                                                                              

3                                                                                              

4                                                                                              

5                                                                                              

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单项选择题

合格投资者应当委托获得证券登记结算机构结算参与人资格的机构进行资金结算。该机构应在开立人民币结算资金账户（）个工作日内将开户情况向国家外汇局备案。

A.1

B.3

C.5

D.7
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