题干

检验铵盐的方法是将待检物取出少量放在试管中,然后(   )

A:加热,将湿润的红色石蕊试纸放在试管口观察颜色变化

B:加水溶解,用红色石蕊试纸检验溶液酸碱性

C:加入NaOH浓溶液,加热,将湿润的红色石蕊试纸放在试管口观察颜色变化

D:加入强碱溶液,加热,再滴入酚酞试液

上一题 下一题 0.0难度 选择题 更新时间:2018-03-20 08:38:48

答案(点此获取答案解析)

C

同类题1

阅读下列短文,从每题所给的四个选项(A、B、C和D)中,选出最佳选项。注意:C篇分A、B两种题型,A(易)种题型为客观题,B(难)种题型为主观题。

    Henry Ford was born on a farm on July 30th, 1863. The farm was near the city of Detroit.

    Henry was always interested in machines. He enjoyed fixing clocks.And he helped repair farm equipment. When Henry was sixteen years old, he left the family farm and went to Detroit to learn more about machines. Henry used what he learned from work to develop engines. In 1903, he was ready to start building cars for the public. On July 15th, 1903, a man named Doctor Pfenning bought the first car from the Ford Motor Company.

    The sale to Doctor Pfenning was the beginning of a huge number of requests for Ford cars.By the end of March, 1904, almost 600 Ford cars had been sold. At the start of 1905, the Ford Motor Company was producing 25 cars each day.

    Henry Ford was sure the future of the automobile industry was in a low-priced car for the general public. He said then, and many times after,“I want to make a car that anybody can buy.”

    In 1907, Henry Ford said: "I will build a motor car for the great mass of people. 1t will be large enough for the family, but small enough for one person to operate and care for. It will be built of the best materials. It will be built by the best men to be employed. And it will be built with the simplest plans that modern engineering can produce. It will be so low in price that no man making good money will be unable to own one.”