问题:
A . More than six short blasts and one long blast on the whistle
B . Continuous blast of the ships whistle for a period of not less than 10 seconds supplemented by the same signal on the general alarm
C . Three short blasts of the whistle supplemented by the same signal on the general alarm
D . More than six short blasts and one long blast on the whistle supplemented by the same signal on the general alarm
● 参考解析
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