硬膜外血肿特征

A．搏动性突眼
B．中间清醒期
C．视神经盘水肿
D．腰穿呈血性脑脊液
E．两侧瞳孔不等大

Some radio waves（）the surface of the earth because of its（）.

A.are capable of following / distance

B.can follow / altitude

C.can hardly follow / shape

D.are unable following / angle