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In readying an auxiliary water-tube boiler for a routine hydrostatic test, which of the following procedures should be undertaken prior to filling the boiler with fresh water?（）
A:The safety valve escape piping should be disconnected from the valve body and a blank inserted
B:The boiler vent valves should be opened
C:All hand-hole/manhole covers should be tightened up as much as possible to preclude any leaks
D:All of the above

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出自：海船船员证

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