A:Warned; accompanied
B:Having warned; accompanying
C:Warning; accompanying
D:Having been warned; accompanying
﹣3、0、1、﹣1四个数中,最小的数是( )
两条直线相交成____,这两条直线叫作互相垂直.其中一条直线叫做另一条直线的____,这两条直线的交点叫做____.