A、tightened
B、secured
C、unfastened
D、loaded
更多“Before leaving the harbour, all derricks must be （）properly.”相关的问题
A、Before leaving the harbour, all derricks must be stowed. B、After leaving the harbour, all derricks must be stowed fore and aft. C、Before leaving the harbour, all derricks must be stowed fore and aft. D、Before leaving the harbour, all heavy derricks must be stowed fore and aft.
A、at the end of the watch B、at any time C、ONLY when properly relieved D、15 minutes before the end of the watch
A、the chief engineer leaves the engineer room with the engine room log book at first B、releasing compressed air in the air receiver and closing the watertight door C、stopping all the running machineries and electric devices D、closing the quick-closing valves of all the oil tanks, stopping the boiler and releasing gas
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