Engine 2014: Engineering Safety

1. A More than six short blasts and one long blast on the whistle.
2. B Continuous blast of the ship's whistle for a period of not  less than 10 seconds supplemented by the same signal on the general alarm.
3. C Three short blasts of the whistle supplemented by the same  signal on the general alarm.
4. D More than six short blasts and one long blast on the whistle supplemented by the same signal on the general alarm.

Tip: press A-D to answer