在五四爱国运动中起决定作用的力量是( )。
A.爱国的青年学生
B.中国无产阶级
C.城市小资产阶级
D.资产阶级及其知识分子
参考答案:B
A magazine is publishing a series of articles on "Modern Life". Readers have been asked to contribute. You write an article about 400 words on clothes and fashions of young people today, and explain how their meanings are determined by social and cultural factors.
莫尔法中,滴定时应剧烈摇动以免因为产生吸附而产生较大误差。( )