默认题库 - 海洋法基本知识

单选题

A mercurial barometer at sea is subject to rapid variations in height (“pumping”) due to the pitch and roll of the vessel. To avoid this error，measurements of atmospheric pressure at sea are usually measured with a(n)（）.

A. syphon barometer
B. cistern barometer
C. aneroid barometer
D. fortin barometer

单选题

A. air bottle for breathing
B. orange smoke canister
C. whistle，light and retroreflective material
D. sea dye marker