题目内容

Tai chi is not onlya traditional activitybut also a display of.

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Tai chi is a combination of slow movements,and meditation.

Taichi is a great way to and can be practiced by young people.

空间形体的正投影可以反映其真实形状和大小

A. 对
B. 错

空间形体在任一投影面上的正投影都比其本身小

A. 对
B. 错