（）is the main center-line structural member，running fore and aft along the bottom of a ship，sometimes referred to as the backbone.<br>A:Frame<br>B:Deckbeam<br>C:Stringer<br>D:Keel

（）is the main center-line structural member，running fore and aft along the bottom of a ship，sometimes referred to as the backbone.
A:Frame
B:Deckbeam
C:Stringer
D:Keel

出自：海船船员证

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