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
更多“The unit of duration of a dash in Morse Code is（）.”相关的问题
A、Duration of the voyage B、Types of cargo units and vehicles to be carried C、Weight of cargo units and vehicles D、All of the above
A、You must provide air transportation to the nearest port of entry in the United States B、You must provide passage to the port of original engagement C、There is no requirement for return to the United States provided the voyage has exceeded 4 weeks duration D、The crew can be employed on another United States vessel，but only if it is returning to the port of original engagement
A、the estimated cost of damage to the unit B、an evaluation of who was at fault C、the amount of ballast on board D、the name of the owner or agent of the unit
A、the estimated cost of damage to the unit B、an evaluation of who was at fault C、the amount of ballast on board D、the name of the owner or agent of the unit
A、A.a blast of from five to seven seconds' duration B、B.a blast of from five to six seconds' duration C、C.a blast of from four to six seconds' duration D、D.a blast of from six to seven seconds' duration
A、a blast of from five to seven seconds' duration B、a blast of from five to six seconds' duration C、a blast of from four to six seconds' duration D、a blast of from six to seven seconds' duration
A、to make the United States gain time to arm itself B、to actually help the aggressors by making clear that the United States would not intervene C、to get the United States involved in the war D、to prevent the United States form being dragged into the war
A、A.having a shorter duration of opening B、B.having a longer duration of opening C、C.closing sooner D、D.opening later
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