Sailing vessels are stand-on over power-driven vessels except（）.

A.in a crossing situation

B.in a meeting situation

C.when they are the overtaking vessel

D.on the inland waters of the PR China

双颞侧偏盲说明________视网膜功能障碍，常见于位于________处的损害，如脑垂体瘤的压迫。