—No way! I don't think should drive.
A:16-years-old,be allowed to
B:16-years—olds,allowed to
C:16-year-olds,be allowed to
D:16-year-old,be allowed to
下图①~④为几种细胞器结构示意图,有关此图的说法正确的是( )
如图,小明在一块平地上测山高,先在B处测得山顶A的仰角为30°,然后向山脚直行100米到达C处,再测得山顶A的仰角为45°,那么山高AD为____ 米(结果保留整数,测角仪忽略不计,2≈1.414,3,1.732)