单项选择题
A cofferdam is（）.
A.any deck below the main deck and above the lowest deck B.a member that gives fore-and-strength C.made by placing two bulkhead a few feet apart D.a heavy fore-and-aft beam under the deck
单项选择题 A combustible gas indicator meter is calibrated to read the percentage of（）.
单项选择题 A container with high cube would most likely be used to stow（）.
单项选择题 A continual worsening of the list or trim indicates（）.
