The core journals of science and technology can be found in China Institute of Science and Technology Information (full name: China Institute of Science and Technology Information), which has related catalogues and can know which journals are core journals of science and technology. (Baidu search: China Institute of Science and Technology Information)
Second, the submission method:
You can visit Wanfang Database to check the contact information (Baidu search: China Digital Periodical Group) and enter the name of the periodical to be submitted. After entering, there are detailed information, including the name of the person in charge of each journal, the telephone number of the editorial department, the submission email address and other information.
In addition, personal suggestions:
Please try to contact the editorial department by telephone for detailed consultation (review time, publication deadline, submission requirements, acceptance category, etc.). Submit your paper again, which will help you publish your paper successfully.
Please keep asking questions.