“九·一八”事变 ,使中日民族矛盾开始上升为中国社会的主要矛盾 ,“中日矛盾变动了国内的阶级关系”。①在这一具有历史意义的重大转折中 ,一切阶级、阶层、政党和历史人物的政治立场、思想观点、爱国情感等都得到了充分展现 ,同时也受到历史严格的检验 ,这是我们研究该时代 The “September 18 Incident” has caused the ethnic conflicts between China and Japan to start to rise as the main contradiction in Chinese society. “The Sino-Japanese conflict has changed the domestic class relations.” ① In this historic turning point, all political positions, ideological points of view and patriotic feelings of all classes, strata, political parties and historical figures have been fully demonstrated, and they have also been subjected to a rigorous historical test. This is what we study era