在图纸空间双击视口内部可进入模型空间，双击视口外侧空白区域可以返回到图纸空间。
查看答案
视口相当于一个图形对象，可以复制、移动、改变大小、删除等。
A. 对
B. 错
在图纸空间只能输入文字，不能绘制图形。
A. 对
B. 错
The following is the Spring Festival activities except
A. sweep the dust
B. have jiaozi
C. stay up late on the Eve
D. dragon boat race
Why do people celebrate Spring Festival nowadays?
A. To have delicious food
B. To wear new clothes
C. To welcome coming of spring
D. To stay at home
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