The exact meaning of material marking is to draw an expansion of a certain hull member after the lofting workmanship, and mark the member expansion on steel plate or fashioned steel with the aid of model plates, model rods or sketches，with the symbols for processing and fabrication marked out on it as well.翻译为：下料就是在放样工艺之后，绘出某一船体构件的展开图；并借助于样板、样棒或草图，在钢板或型钢上标出构件的展开图，供加工和装配用的符号也应标在钢板和型钢上。
A、正确
B、错误