2H

词形变化

2Hs 复数 2Hs

释义与例句

n.
  1. 1.

    A grade of pencil with lead that makes lighter marks than a pencil grade H but darker marks than a pencil of grade 3H; a pencil with hard lead.

    不可数
  2. 2.

    A pencil of grade 2H.

    不可数
  3. 3.

    Alternative form of ²H (“hydrogen-2”)

    不可数