3H

词形变化

3Hs 复数 3Hs

释义与例句

n.
  1. 1.

    A grade of pencil with lead that makes lighter marks than a pencil grade 2H but darker marks than a pencil of grade 4H; a pencil with hard lead.

    不可数 英国
  2. 2.

    A pencil of grade 3H.

    不可数
  3. 3.

    tritium. In this case, the "3" should be superscripted: ³H.

    不可数