加热炉的二次燃烧一般发生在对流室。
参考答案：对
根据我国《保险法》的规定，保险事故是指保险合同约定的保障责任范围内的事故。
My suggestion is ()we should have mercy ()these homeless children and offer them some help.
A．that; on
B．what; to
C．which; for
D．that; for
