单项选择题
In vessel construction, beam are transverse girders which provide support to（）.
A.bulkheads B.deckhouse structures C.decks D.vertical frames
单项选择题 Inerting means（）.
单项选择题 It is essential for（）to give a complete description of damage and shortage in the discharging report.
单项选择题 It is not advisable to use nylon for alongside towing because it（）.
