For existing ships，（）is not an improvement to safety.<br>A:the reinforcement of the aft transverse watertight bulkhead<br>B:the double bottom structure in way of the foremost cargo hold<br>C:the introduction of a more rigorous survey regime and greater attention to operating procedures<br>D:introduction of new and improved designs

For existing ships，（）is not an improvement to safety.
A:the reinforcement of the aft transverse watertight bulkhead
B:the double bottom structure in way of the foremost cargo hold
C:the introduction of a more rigorous survey regime and greater attention to operating procedures
D:introduction of new and improved designs

出自：海船船员证

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