🔍 Key Concepts

• Difference between a seam and a butt in shell plating • How hull plating is arranged in strakes (rows of plates) and courses (lengthwise) • Meaning of terms span and sheet line in relation to plating joints

💭 Think About

• Look closely at how the plates meet at point D: are their edges aligned end-to-end in the same strake, or side-by-side between two adjacent strakes? • Ask yourself whether the term describes a joint between plates, or something completely different like a dimension (distance) or a drawing reference line. • Compare the joint at D with any horizontal or vertical joints nearby — which shipbuilding term is normally used for that orientation of plate joint?

✅ Before You Answer

• Confirm that the choice you pick is a term used for where two shell plates are welded together. • Verify whether a seam usually runs longitudinally between plate rows, and a butt is where plate ends meet in the same row. • Eliminate any answers that do not normally describe a weld or joint in shell plating (for example, a distance or a layout line).