灰　度（注：注：B = black黑 (soft软) HB = half black (medium soft) F = firm H = hard）：

• 灰度

  8B

  7B

  6B

  5B

  4B

  3B

  2B

  B

  HB

  F

  H

  2H

  3H

  4H

  5H

  6H

  √

  √

  书写

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  制图

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  设计

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  素描

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