单选题The unit of duration of a dash in Morse Code is（）.Aone and one-half times the length of a dotBtwice the length of a dotCthree times the length of a dotDfour times the length of a dot
单选题
The unit of duration of a dash in Morse Code is（）.
A
one and one-half times the length of a dot
B
twice the length of a dot
C
three times the length of a dot
D
four times the length of a dot
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