单项选择题
（）is not a static load.
A.Actual weight of the ship's structure，outfitting，equipment and machinery B.Ballast load（weight） C.Cargo load D.Slamming and sloshing load
单项选择题 （）is not a longitudinal structural member.
单项选择题 What is used to prevent twisting of a towing bridle?（）
单项选择题 What is the purpose of cant frames in steel vessels? （）
