单项选择题

[3-1体的三面投影与三视图] 正垂面在正投影面的投影特性为：（）
A、收缩性
B、积聚性
C、显示性
D、垂直性

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《三国演义》中在渭水杀得曹操割须断袍的是？

答案： 1.马超
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正确答案：马超
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单项选择题

What’s the true wisdom that the Book of Zhuangzi has brought to us?

A．It emphasizes the value of naturalness and simplicity and teaches us to follow the essence of the Dao (Tao).
B．It emphasizes that success does not lie in practice but in the “unconsciousness”.
C．It stresses the importance of persistence and warns us not to “go with the flow”.
D．It tells us that the highest proficiency of skill is attained only by those who have great ambition.