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[单选题]
Python语句a=[1,2,3,None,[[]],[]]print(len(a))以上代码的运行结果是()
A.4
B.5
C.6
D.7
查看答案
![](https://static.youtibao.com/asksite/comm/h5/images/solist_ts.png)
A.4
B.5
C.6
D.7
A.x=5;y=5;z=5
B.xyz=5
C.x,y,z=5
D.x=5, y=5, z=5
A.A.insentivize
B.B.non insentivize
C.C.insentivize和non insentivize两种
D.D.以上均不对
A.A.Disruptive
B.B.non Disruptive
C.C.A和B都不对
D.D.A和B都选
求顶点为(1,2,3),轴与平面2r+2y-s+1=0垂直、母线和轴夹角为的圆柱面的方程。
求向量组α1=(1,1,1),α2=(0.1.1)·α3=(1,0,0)与向量组β1=(1,2,3),
β2=(1,0,1)月β3=(1,1,2)的秩.问α1,α2,α3与β1,β2,β3是否等价?