What did the writer think of Tom when he heard of his death?
下列词语书写错别字最少的一项是( )
①增加铁的量 ②将容器的体积缩小一半
③保持体积不变,充入N2使体系压强增大 ④保持体积不变,充入水蒸汽使体系压强增大.