问答题

曲面3x2+y2+z2=12上点M(-1,0,3)处的切平面与平面z=0的夹角是(    ).
   A.    B.    C.    D.

A.

B.C.174.24.96:6088/Latex/latex.action?latex=XGZyYWN7z4B9ezZ9'
D.E.174.24.96:6088/Latex/latex.action?latex=XGZyYWN7z4B9ezR9'
F.G.174.24.96:6088/Latex/latex.action?latex=XGZyYWN7z4B9ezN9'
H.I.174.24.96:6088/Latex/latex.action?latex=XGZyYWN7z4B9ezJ9'
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