A、to keep the boats covered at all times
B、not to leave steel or iron tools lying in or near these boats
C、to keep an electric charge on the hull at all times
D、to rinse these boats regularly with salt water
更多“Aluminum lifeboats are subject to damage by electrolytic corrosion (the aluminum being eaten away). In working around boats of aluminum you must be very careful（）.”相关的问题
A、The aluminum will provide greater resistance to the spread of fire by conduction B、The aluminum structure is usually attached to a steel coaming by a method that insulates the two metals C、If the superstructure is stressed，an aluminum structure requires additional expansion joints to prevent fracture D、The steel at the area of the aluminum-to-steel connection must be closely checked for galvanic corrosion
A、reduce the ring groove wear rate B、seal against crankcase vapors C、lessen the wear on aluminum part of the cylinder D、allow for the greater expansion rate of aluminum
A、lifeboat is no longer needed B、lifeboat is needed badly C、lifeboat is needed not more D、lifeboat is urgently needed
A、forward of lifeboat No. 4 on the starboard side B、forward of lifeboat No. 4 on the port side C、aft of lifeboat No. 1 on the starboard side D、All of the above
A、forward of lifeboat No.4 on the starboard side B、forward of lifeboat No.4. on the port side C、aft of lifeboat No. 1 on the starboard side D、All of the above
A、control the descent rate of a lifeboat B、control the ascent rate of a lifeboat C、cut off power to the winch when the lifeboat nears the final stowed position D、cut off power to the winch when the lifeboat reaches the davit bumpers
A、Corner fittings B、Framework，primarily the corner posts C、Framework and siding acting as a girder D、Aluminum side and end panels
A、secure the lifeboat in the davits when in the stowed position B、bring the lifeboat close along the rail in the embarkation position C、give the occupants a safety line when the boat is being lowered from the embarkation level D、reduce the swinging of the lifeboat at the embarkation level
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