While steaming slowly in the harbor，no ship is （） to exceed the speed limited．

The height of eye correction is smaller than geometrical dip because of （）.

A. the angle between the horizontal and the line of sight to the visible horizon
B. index error
C. parallax
D. terrestrial refraction

点击查看答案

In Admiralty Sailing Directions，STRIPES is the word used to indicate （）marking.

A.horizontal
B.vertical
C.diagonal
D.vertical or diagonal

点击查看答案