The unit of duration of a dash in Morse Code is（）.<br>A:one and one-half times the length of a dot<br>B:twice the length of a dot<br>C:three times the length of a dot<br>D:four times the length of a dot

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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