某厂高压加氢卧式罐上装有一台外沉筒液位计，下部取压孔开在阀1处，用过一段时间后，液位计反应迟缓，最后不能工作，主要原因是什么？如何改装？
参考答案：
①主要原因是阀互取压点在脱水包最下部，罐内杂物易沉入沉筒室的连通管路中，使沉筒不能正常工作。
②解决办法：重新安装，下部取压孔开在阀2，或阀3位置上，使取压点距罐底壁200mm左右（另外将原引压管延伸到罐内距罐底200mm处的方法也是可行的）
| Martin Luther King, Jr., is well known for his work in civil rights and for his many famous speeches, among them his moving "I Have A Dream" speech. But fewer people know much about King’s childhood. M. L., as he was called, was born in 1929 in Atlanta, Georgia, at the home of his maternal grandfather. M.L.’s grandfather, the Reverend A. D. Williams, purchased their home on Auburn Avenue in 1909, 20 years before M. L. was born. The Reverend Williams, an eloquent speaker, played an important role in the community since so many people’s lives centered around the church. He allowed his church and his home to be used as a meeting place for a number of organizations dedicated to the education and social advancement of blacks. M.L. grew up in this atmosphere, with his home being used as a community gathering place, and was no doubt influenced by it. M. L.’s childhood was not especially eventful. His father was a minister and his mother was a musician. He was the second of three children, and he attended all-black schools in a black neighborhood. The neighborhood was not poor, however. Auburn Avenue was the main artery through a prosperous neighborhood that had come to symbolize achievement for Atlanta’s black people. It was an area of banks, insurance companies, builders, jewelers, tailors, doctors, lawyers and other black-owned or black-operated businesses and services. Even in the face of Atlanta’s segregation, the district thrived. Dr. King never forgot the community spirit he had known as a child, nor did he forget the racial prejudice that was a seemingly insurmountable barrier that kept black Atlantans from mingling with whites. |
The word,’ mingling" underlined in Paragraph 2 refers to ______.
A．interfering
B．gargling
C．consuming
D．associating