搜题请搜索小程序“爱下问搜题”
问题 单项选择题

中国社会主义民主政治最鲜明的特点，且是我国人民当家做主的重要途径和最高实现形式是( )。

A．多党合作制度
B．政治协商制度
C．人民代表大会制度
D．民主区域自治制度

答案

参考答案：C

填空题

根据短文内容，从下面方框中选择适当的词组填空。   

One afternoon just before Christmas, an old kind man was walking in the street when he saw a little boy crying   小题1: a beautiful shop window. The old man asked why he was crying there. The little boy said that he lost the ten dollars given by his mother. When the old man heard this, he   小题2: a small wallet and gave him what was inside. The little boy thanked him and stopped crying and smiled. The man  小题3: .

An hour later, the old man was returning home by the route. To his surprise, he saw the boy at the same place. He went up to him and asked if he had lost his money again. The little boy said that he had found the lost ten dollars. He   小题4: him there. He wanted to  小题5:  the ten dollars to him.
查看答案
实验题

（13分）实验室需要0.1 mol/L NaOH溶液450 mL和0.5 mol/L硫酸溶液500 mL。根据这两种溶液的配制情况回答下列问题：

(1)如图所示的仪器中配制溶液肯定不需要的是________(填序号)，配制上述溶液还需用到的玻璃仪器是________________(填仪器名称)。

(2)下列操作中，容量瓶所不具备的功能有________(填序号)。

A．配制一定体积准确浓度的标准溶液

B．贮存溶液

C．测量容量瓶规格以下的任意体积的液体

D．准确稀释某一浓度的溶液E．量取一定体积的液体

F．用来加热溶解固体溶质

(3)根据计算用托盘天平称取NaOH的质量为______g。在实验中其他操作均正确，若定容时仰视刻度线，则所得溶液浓度________0.1 mol/L(填“大于”、“等于”或“小于”，下同)。若NaOH溶液在转移至容量瓶时，洒落了少许，则所得溶液浓度_______0.1 mol/L。

(4)根据计算得知，所需质量分数为98%、密度为1.84 g/cm3的浓硫酸的体积为__________mL(计算结果保留一位小数)。如果实验室有15 mL、20 mL、50 mL量筒，应选用________mL量筒最好。配制过程中需先在烧杯中将浓硫酸进行稀释，稀释时操作方法是_____________________________。
查看答案