I am to my parents for all that they have done for me. (grateful)
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I was filled with ______ after I achieved great success through hard work. (proud)
正等轴测图的轴间角为( )
A. 120°
B. 60°
C. 90°
正投影的基本特性是显示性,积聚性和类似性。
A. 对
B. 错
旅游业是“建立在流沙上的大厦”,因此,我国不宜发展旅游业。
A. 对
B. 错