A、fire alarm
B、boat alarm
C、man overboard
D、emergency alarm
更多“Seven short blasts continued for one minute means （）.”相关的问题
A、6 short blasts and 1 long blast B、long blast mare than 6 short blasts C、more than 6 short blasts and 1 long blast D、1 long blast of at least 10 seconds
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、a light signal of at least five short and rapid flashes B、one prolonged，one short，one prolonged，and one short whistle blasts C、four short whistle blasts D、two short whistle blasts
A、no fog signal B、one short blast C、one prolonged and three short blasts D、one prolonged，one short，and one prolonged blast
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