【简答题】If there are 1200 articles published in a journal from 2017 to 2018,these articles received totally 3600 citations(sum of number of times cited )in 2019, the impact factor of the journal in 2019 shoul...
【简答题】The biggest festival 1______ the Chinese calendar is the New Year. The date 2_____ the New Year depends 3______ the moon so it changes every year, but it is always 4_____ January or February. 5_____ C...
【单选题】If we conduct factor analysis for investigating the impact of sustainability in performance of hotels, what data about hotel companies is the least relevant?