问题：

大家帮我分析下下面三个英语句子吧,1.Machinetoolframesaregenerallymadeincastiron,althoughsomemaybesteelcastingormild-steelfabrications.2.Toavoidmassivesectionsincasting,carefullydesignedsystemsofribbingareus

更新时间：2024-04-19 21:55:56

问题描述：

大家帮我分析下下面三个英语句子吧,

1.Machinetoolframesaregenerallymadeincastiron,althoughsomemaybesteelcastingormild-steelfabrications.

2.Toavoidmassivesectionsincasting,carefullydesignedsystemsofribbingareusedtoofferthemaximumresistancetobendingandtorsionalstresses.

3.Theseelementsmaybeusedseparatelyorcombinedinvariouswaysaccordingtotheapplications.

胡玉琛回答：

　　她已经在三个不同的场合被警告,她的业务水平不够好.that引导的是宾语从句.做warn的宾语.warn的用法warnsb.ofsth.警惕某人做某事warnsb.againststh.警惕某人不做某事warnsb.(not)todosth.警惕某人（不）...