题干
____ (they/their) like to play pingpong. Playing pingpong is ____ (they/their) favourite school work.
答案(点此获取答案解析）
They,their
qZ(g) △H<0,m+n>q,在恒容的密闭容器中反应达到平衡时，下列说法正确的是（ ）