線段AB=4cm,在線段AB上截取BC=1cm,則AC=() A. 1cmB. 2cmC. 3cmD. 4cm

線段AB=4cm,在線段AB上截取BC=1cm,則AC=() A. 1cmB. 2cmC. 3cmD. 4cm

AC=AB-BC=4-1=3cm,故選:C.