![](https://static.youtibao.com/asksite/comm/h5/images/m_q_title.png)
[单选题]
已知列表lis=【'a','bc','def'】,则执行print(len(lis))语句输出的结果是()
A.3
B.4
C.5
D.6
![](https://static.youtibao.com/asksite/comm/h5/images/m_q_a.png)
A、3
![](https://static.youtibao.com/asksite/comm/h5/images/solist_ts.png)
A.3
B.4
C.5
D.6
A、3
A.Y=C
B.Y=ABC
C.Y=AB+C
D.Y=BC
已知:如图,△ABC中,∠C=90°,CM⊥AB于M,AT平分∠BAC交CM于D,交BC于T,过D作DE∥AB交BC于E,求证CT=BE.![]() |
已知:如图,B、C、E三点在一条直线上,AB=AD,BC=CD. (1)若∠B=90°,AB=6,BC=2 (2)若∠BAD+∠BCD=180°,cos∠DCE= |
已知△ABC的顶点坐标为A(3,4),B(-2,-1),C(4,5),D在BC上,且S△ABC=3S△ABD,则AD的长为______. |
如图,已知CE为△ABC中∠C的平分线,AD∥CE交BC延长线于D,如果F为AD的中点,求证:CF⊥CE.![]() |