单项选择题
The principal purpose of adjustment of the magnetic compass is to eliminate（）as far as possible.
A.variation B.compass error C.deviation D.earth's magnetic force
单项选择题 The routing system which aimed at reducing the risk of casualties is called as（）.
单项选择题 The ship has a list of 5 degrees（）starboard.
单项选择题 The shippers hope each mate’s receipt is to be signed right after the cargo（）is loaded.
