A:0.63×10﹣6m
B:6.3×10﹣7m
C:6.3×10﹣8m
D:63×10﹣8m
28个 ,可以搭成几个 ,还剩几个?
If you don't know the meaning of the word, try to ______ it.
已知角θ的顶点与原点重合,始边与x轴正半轴重合,终边在直线y=2x上,则sin2θ+π4的值为( )