【单选题】When _______cruel man was hurting the children, there were no adults around who were able to stop______hurting.
【简答题】翻译下面的句子。 The man his sight in the accident. The children were out of sight. They run away. There were no more mountains in sight.
【单选题】在对称平面垂直的投影面上的投影图,以对称线为界一半画外形图、一半画剖面图,这种剖面图称为( )
【简答题】冷风机按照冷却空气采用的方式分有( )、( )、( )几种形式。
【简答题】冷风机按照冷却空气采用的方式分有 、 、 几种形式。
【单选题】如果形体是对称的,画图时常把形体投影图以对称线为界一半画外形图、一半画剖面图,这种剖面图称为()。
【单选题】在对称平面垂直的投影面上的投影图,以( )为界一半画外形图、一半画剖面图,这种剖面图称为半剖面图。
【单选题】在对称平面垂直的投影面上的投影图,以()为界一半画外形图、一半画剖面图,这种剖面图称为半剖面图。