test card

短语

[医] 视力卡

词形变化

test cards 复数 test cards

别名

testcard

释义与例句

n.
  1. 1.

    A card printed with various letters or symbols, used in testing vision.

  2. 2.

    A test signal, typically broadcast at times when the transmitter is active but no programme is being broadcast (often at startup and closedown).

    英国 媒体