单选题（）is the main center-line structural member，running fore and aft along the bottom of a ship，sometimes referred to as the backbone.AFrameBDeckbeamCStringerDKeel
单选题
（）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
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