When writing an English email, the recipient is a lecturer or teaching assistant. What should I call it?

In American universities, the level of teachers is usually like this: professor-associate professor-assistant professor-lecturer.

In the letter, if the other party is a professor, call the other party a professor to show respect; Otherwise, call the other person Mr. or Mrs., if you know the other person's name, call him "Mr. XX" or "Ms. XX", if you don't know the other person's name, call him "Mr." or "Mrs.".

Are there 34 or 68 universities in China that recruit graduate students independently? Which schools are they?

Which school's accounting major is better for cross-professional examination?

How are the dormitory conditions in xidian university?

What schools are there in the two police schools?

Is there a subway between several campuses of Jida University?

The wind tunnel is called "the cradle of airplanes". What famous wind tunnels are there in the world and what are there in China?

What are the 100 universities in Asia?

What is the cause and effect of the violence in the First Affiliated Hospital of Nanchang University?

What is the undergraduate English textbook of Nankai University School of Economics?

Big brothers and sisters of Chinese People's Public Security University look over ~