2. 外语
  3. Before the invention of photoengraving, steel and copperplate engraving served as the principal means of reproducing illustratio

Before the invention of photoengraving, steel and copperplate engraving served as the principal means of reproducing illustratio

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问题 Before the invention of photoengraving, steel and copperplate engraving served as the principal means of reproducing illustrations.
选项 A、visions
B、pictures
C、advertisements
D、pages
答案B
解析 插图，图片
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