A.
B.
C.
D.
[单选题]求A.B.C.D.
[单选题]求A.0B.1C.eD.
[单选题]求
[单选题]求A.椭球面B.旋转双曲面C.旋转抛物面D.圆柱面
[问答题]求
[单选题]求A.ι1与ι2垂直B.ι1与ι2相交,但不一定垂直C.ι1与ι2为异面直线D.ι1与ι2平行
[单选题]求A.1B.2C.3D.4
[单选题]求A.(0,1)TB.(1,2)TC.(-1,1)TD.(1,0)T
[单选题]求A.0B.1C.eD.e2