题目内容

（单选）过曲线上一点的切线,其投影:

A. 与曲线的同面投影不一定相切
B. 与曲线的投影仍相切,但切点发生了变化
C. 与曲线的投影相切于该点的同面投影上
D. 不与曲线的同面投影相切

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