19.中国花了近2000亿美元用于研究和开发。 A: China spent nearly $200 billion on research and development. B: China spent nearly $200 million on research and development. C: China spent nearly $20 billion on research and development. D: China spent nearly $20 million on research and development.

The research team surveyed ten couples over 20 years.

What are the main sources of marketing research information？: higher research|primary research|secondary research|thirdly research

In the research methodology of an empirical research in Zhijiang College, we need to introduce _________. A: research question B: research hypothesis C: research background D: research procedure E: research instrument

What are two types of research？ A: One research B: Primary research C: Two research D: Secondary research

According to the research content, scientific research topics can be divided into (). A: theoretical research topics B: basic research topics C: applied research topics D: developmental research topics

Which of the following is NOT an essential element in an empirical research paper? A: Research limitations. B: Research method. C: Research conclusion. D: Research subjects.

What are the two basic ways of research in scientific sense? A: Primary research B: Natural research C: Social research D: Secondary research

The research group is()6 teachers and 20 students. A: made of B: made up C: made from D: made up of

There are research backgrounds, research significances, research objectives and paper construction in the Introduction.