单项选择题
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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相关考题
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单项选择题
The range of a SSB transmission is MOST affected by（）.
A.atmospheric noise and radiated power
B.the frequency band selected and time of day or night
C.interference and position of the moon
D.radiated power and nearness to shore -
单项选择题
The light rhythm of Morse (A) is shown on（）.
A.preferred-channel buoys
B.starboard- or port-side buoys
C.special marks
D.safe water buoys -
单项选择题
The following（）is a standard phrase.
A.You may enter fairway
B.You should enter fairway
C.ANSWER. It is permitted to enter fairway
D.You could enter fairway
