问答题

设有直线L1与L2则L1与L2的夹角为(    ).
   (A)
   (B)
   (C)
   (D)

A.174.24.96:6088/Latex/latex.action?latex=eCsxPVxmcmFje3ktNX17LTJ9PXorOA%3D%3D'
B.174.24.96:6088/Latex/latex.action?latex=XGxlZnRce1xiZWdpbnthcnJheX17Y314LXk9NlxcMnkrej0zXGVuZHthcnJheX0%3D'
C.

D.174.24.96:6088/Latex/latex.action?latex=XGZyYWN7XHBpfXs2fQ%3D%3D'
E.174.24.96:6088/Latex/latex.action?latex=XGZyYWN7XHBpfXs0fQ%3D%3D'
F.174.24.96:6088/Latex/latex.action?latex=XGZyYWN7XHBpfXszfQ%3D%3D'
G.174.24.96:6088/Latex/latex.action?latex=XGZyYWN7XHBpfXsyfQ%3D%3D'
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