选择题:图16中,已知直线MN和直线EF均与平面ABC交于K点,则水平投影面上全部可见的线段(未给出)为( 

题目内容:
图16中,已知直线MN和直线EF均与平面ABC交于K点,则水平投影面上全部可见的线段(未给出)为(   )

选择一项:
A. fk和nk
B. ek和nk
C. fk和mk
D. ek和mk
参考答案:

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