【单选题】While every effort is made to ensure that the data provided through the Notices to Mariners service is accurate,the user needs to be aware of the risks to corruption of data. It is important that the ...
【简答题】Listen and write the corresponding letter in the right place. a. Conduct interviews for further data. b. Choose the research methods. c. Determine the samples of the survey. d. Pre-test the question...