ad in

英 美
  • 发球人得的第一分
  • ad abbr.广告(=advertisement)abbr.公元(=AnnoDomini)
  • in prep.在...里;在...地方;在...期间;在...方面;进入...里面;处于...状态;穿着...;以...的方式adv.在家;入;进;向里;在某地;并入;在某种关系中adj.在里面的;新来的;执政的;时髦的n.当权者;影响;达成目标的路径
    1. A material added in small amounts during a chemical or metallurgical process to absorb impurities.
      吸气剂以少量加入化学或冶金过程中用来吸收杂质的物质
    2. A substance, such as boron, added in small amounts to a pure semiconductor material to alter its conductive properties for use in transistors and diodes.
      掺杂质,掺质剂加入纯半导体材料中的少量硼等物质,用于晶体管和二极管中以改变半导体的导电率