Preliminary study on the mode of sea exploition Preliminary study on the molecular mechanism of soybean regeneration Preliminary study on writers' mindset and literary creation 并列题名:Preliminary study on the molecular mechanism of soybean regeneration Preliminary study on the "New Normal" of China's economy 并列题名:Preliminary study on writers' mindset and literary creation Empirical study of human resources exploitation Preliminary Study on the Prohibition System of Securities Fraud Preliminary study on the criticism patterns of Chinese art Preliminary study on the transformation of consumption-led economy