单选题Each part of the fire-main system located on an exposed deck must be（）.Aprotected against freezingBlocked to prevent theftCnumbered sequentiallyDpressurized at all times
单选题
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
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