3H
词形变化
3Hs
复数
3Hs
释义与例句
n.
-
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.
A pencil of grade 3H.
不可数 -
3.
tritium. In this case, the "3" should be superscripted: ³H.
不可数