[填空题] A c（） sentence contains two or more clauses， one of which is incorporated in the other.

燃烧是放热发光的（）反应。 ["还原","氧化还原","物理"] 表及控制系统接地系统的作用是（）。 ["系统的需要","保护设备安全","保护人身安全","抑制干扰"] 教育的社会制约性 “五育并举”的教育方针中实利主义教育相当于（）。 ["德育","智育","体育","劳育"] 新闻述评 A c（） sentence contains two or more clauses， one of which is incorporated in the other.