Whitman has made radical changes in the form of poetry by choosing free verse as his medium of expression. What are the characteristic of Whitman’s free verse

如果在试验过程中，闻到烧焦的气味应如何办？（）

A.关机走人

B.打开通风装置通风

C.立即关机并报告相关负责人员D.请同实验的人帮忙检查