单项选择题
There is sufficient anchorage for（）at all time around the No.1 buoy and for smaller vessels around the No.4 buoy.
A.deep laded vessels B.deeply load vessels C.deep loading vessels D.deeply loaded vessels
单项选择题 The shortest distance between any two points on earth defines a（）.
单项选择题 The positions and characteristics of lights and buoys shown within the port area are（）.
单项选择题 The period of a lighted aid to navigation refers to the（）.
