🔍 Key Concepts

• Structure of a ship’s double bottom and tank top • Names and functions of floors, stringers, and intercostals • Which members run athwartships (side to side) versus longitudinally (fore‑and‑aft)

💭 Think About

• First, picture the double bottom area: what part actually connects the tank top plating to the outer bottom shell? • Which of the listed members are primary transverse frames versus longitudinal stiffeners or supports? • For each option, ask: does this term usually describe a fore‑and‑aft member or an athwartship framing member in the bottom structure?

✅ Before You Answer

• Identify which member is the transverse vertical plate spanning between bottom shell and tank top • Verify which terms (stringers, intercostals) normally describe longitudinal stiffeners rather than the main transverse frame • Confirm that the correct answer refers to the main plate frames in the bottom structure, not just secondary supports