实验室制取二氧化碳的最合适原料是(    ) A.石灰石与浓盐酸  

实验室制取二氧化碳的最合适原料是(   
A.
石灰石与浓盐酸                 B.石灰石与稀盐酸
C.
碳酸钠与稀盐酸                 D.石灰石与稀硫酸

答案

B

相关题目

如图所示是实验室用一定质量的氯酸钾和二氧化锰混合物为
如图所示是实验室用一定质量的氯酸钾和二氧化锰混合物为原料制氧气时,一些物质的质量随时间的变化关系图象,其中错误的图象是( ) A.  B. 
2.The flowers were so lovely that they ____ in no time. A. sold B. had been sol
2.The flowers were so lovely that they ____ in no time. A. sold B. had been sold C. were sold D. would sell
用两个圆形南瓜做杂交实验,子一代均为扁盘状南瓜。子一
用两个圆形南瓜做杂交实验,子一代均为扁盘状南瓜。子一代自交,子二代出现扁盘状、圆形和长形三种南瓜,三者的比例为9:6:1,现对一扁盘状南
We spent a day in the country, picking wild flowers. With the car full of flowe
We spent a day in the country, picking wild flowers. With the car full of flowers we were going home. On our way back my wife noticed a cupboard (柜厨) outside a furniture shop. It was tall and n
 江苏省是我国东部经济较发达的省份之一,区域内既有密切
 江苏省是我国东部经济较发达的省份之一,区域内既有密切的联系又存在着明显的南北差异。阅读材料,回答下列问题。 材料一 下表为某年江苏省区
读某城市“城市人口占总人口比重变化图”和“劳动力在各
读某城市“城市人口占总人口比重变化图”和“劳动力在各行业中的百分比图”,回答                         上图中,⑤→⑥反映的现象
江苏省经济发展水平南北差异较大,目前相对发达的苏南将
江苏省经济发展水平南北差异较大,目前相对发达的苏南将部分产业向苏中、苏北转移。这既为接受地增加了发展动力,也为转出地产业升级腾出了空
There were few doctors, _____ he had to work very hard _____ his own.    A.
There were few doctors, _____ he had to work very hard _____ his own.    A. and; in         B. because; at      C. so; on           D. when; for

最新题目