【单选题】于供试品溶液中加入某种试剂,在一定条件下反应,观察有无阳性结果出现,以判断杂质是否超标的方法属于()
【单选题】下列哪一项不是学校体育对提高学生社会适应能力的作用?( )
【单选题】Recent tensions between the two countries were a direct result of
A.
their border conflicts.
B.
their military build-up.
C.
killings in the two countries.
D.
their mutual distrust.
【简答题】兴于诗,立于礼,成于 _____ 。《论语》
【单选题】兴于诗,立于礼,成于 _____ 。《论语》