The survey was conducted from November to December 2019, a total of 50 questionnaires, the effective response rate was 100%, the northern, central, southern, eastern and Islands have 14,14,13,9 schools underwent questionnaire.
The survey was conducted in November-December 2019, with a total of 50 questionnaires and a 100% effective questionnaire recovery rate, with 14, 14, 13 and 9 schools in the north, central, southern, eastern and outlying islands.
The survey time is from November to December 2019, with a total of 50 questionnaires recovered, and the effective questionnaire recovery rate is 100%. Among them, 14, 14, 13 and 9 schools in the north, middle, South, East and outlying islands each accept the questionnaire survey.<br>