Engine 2014: Electricity

1. A They should be operated and inspected at least once daily anytime that the vessel is navigated.
2. B They should be operated and inspected at least once in each week that the vessel is navigated.
3. C They should be operated and inspected at least once in each month that the vessel is navigated.
4. D They should be operated and inspected at least once in each six month period that the vessel is navigated.

Tip: press A-D to answer