• 2022-05-31
    已知两条直线[img=194x23]180344053960dcf.png[/img],其中[img=46x20]1803440541b6f3f.png[/img],当这两条直线的夹角在[img=56x39]180344054974094.png[/img]内变动时,a的取值范围是()
    A: [img=42x29]180344055299a22.png[/img]
    B: [img=78x48]180344055c528bf.png[/img]
    C: [img=139x48]1803440566a70b1.png[/img]
    D: [img=58x30]1803440570b3132.png[/img]
  • 举一反三