copying pencil造句
造句與例句
手機版
- Copying pencils saw extended use in World War I in the completion of a wide range of paperwork.
- Some documents that were to be copied with copying presses were written with copying pencils rather than copying ink.
- Suddenly he stopped at one spot and taking out a copying pencil he drew a circle around that spot.
- Consequently, the copying pencil was being used as an indelible pencil, a precursor to the ball-point pen.
- Copying pencils were introduced in the 1870s, and were originally marketed for copying documents, especially for making permanent copies of a permanent original.
- The cores of copying pencils, which appear to have been introduced in the 1870s, were made from a mixture of graphite, clay, and aniline dye.
- This was achieved by creating a hand written document using a copying pencil, laying a moist tissue paper over the document and pressing down with a mechanical press.
- The copying pencil served as a convenient substitute for the fountain-pen : it could be carried on one's person without need for ink or fear of leaks.
- Since the aniline dye was poisonous to humans, many injuries and illness related to copying pencils were reported in the medical literature, especially in the late-19th-and early-20th centuries.
- Furthermore, for producing copies using carbon paper, copying pencils were considered superior to both ordinary pencils ( whose writing in the original could be erased ) and fountain-pens ( whose nibs could not always withstand the pressure needed to produce the carbon-copy ).
- It's difficult to see copying pencil in a sentence. 用copying pencil造句挺難的
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