单项选择题
A.on the prime vertical B.on the celestial horizon C.at lower transit D.on the Greenwich meridian
A lashing used to secure two barges side by side，lashed...
单项选择题A lashing used to secure two barges side by side，lashed in an "X" fashion，is called a （）.
A.quarter line B.back line C.peg line D.jockey line
A.scissor wire B.towing wire C.breast wire D.cross wire
Information on the operating times and characteristics ...
单项选择题Information on the operating times and characteristics of foreign radiobeacons can be found in which publication? （）.
A.List of Lights B.Coast Pilot C.Sailing Directions D.List of Radiobeacons
