有一种精密仪器零件长是5毫米,画在图纸上的长度是8厘米,求这幅图纸的比例尺.
5毫米=0.5厘米,
8:0.5,
=80:5
=16:1;
答:这幅图纸的比例尺是16:1.
I missed the football match yesterday, Tell me the ____of it. Who won?
A.result
B.reason
C.rest
D.report
什么叫做正投影?