单项选择题
When a vessel is stationary and in a hogging condition，the main deck is under（）.
A.compression stress B.tension stress C.shear stress D.racking stress
单项选择题 What would have the greatest affect on a vessel’s longitudinal strength? （）
单项选择题 What term indicates a curvature of the decks in a longitudinal direction?（）
单项选择题 What is NOT a problem when carrying coal? （）
