直线的坡度和平距互为倒数,坡度愈大,平距_____________。
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标高投影为单面正投影,也就是在__________投影上加注高程数字的一种图示方法。
万维网www实际是一个分布式信息系统。
A. 对
B. 错
Though she is nearly 65, Mary doesn’t want to .
A. accomplish
B. conquer
C. over
D. retire
Tom invented (发明) a to make the door shut by itself.
A. device
B. voyage
C. discovery
D. truth