单项选择题 The fuel booster pump and steam to fuel heater, together with fuel pipe heater tracer line should be shut off as soon as the （） order is acknowledged.

单项选择题 During the watch at sea, where situations occur in the machine apace which may affect the speed maneuverability, power supply or other essentials for the safe operation of the ship（）should be informed as soon as possible.

单项选择题 During the watch at sea （） should be logged or recorded in the engine log book.