Each part of the fire-main system located on an exposed deck must be（）.<br>A:protected against freezing<br>B:locked to prevent theft<br>C:numbered sequentially<br>D:pressurized at all times

Each part of the fire-main system located on an exposed deck must be（）.
A:protected against freezing
B:locked to prevent theft
C:numbered sequentially
D:pressurized at all times

出自：海船船员证

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