🔍 Key Concepts

• inner bottom in ship construction terminology • difference between tank top and the space beneath it • how the double bottom structure is defined on a ship

💭 Think About

• Look at each choice and ask: is this describing a surface, an added plate, a boundary, or a whole space? Which one matches a proper definition used in ship construction texts for 'inner bottom'? • Think about where ballast or fuel tanks in the double bottom are located: is the inner bottom the plate you walk on, the extra plate on the keel, the side shell, or the entire compartment? • Consider how the term tank top is used on cargo ships and engine rooms: is the inner bottom the same thing as the tank top, or is it something different?

✅ Before You Answer

• Verify which choice refers to an actual structural deck or plating surface forming the top of the double bottom tanks. • Make sure you are not confusing the space between two structures with the plate or surface itself. • Eliminate any option that mainly describes side shell plating or a general watertight boundary, rather than a specific inner bottom structure.