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Fire protection regulations for towing vessels require any fuel line subject to internal head pressure from fuel in the tank to（）.
A:be fitted with a positive fuel shut-off valve located at the tank
B:have a shut-off valve at the top of the tank
C:have a gate valve easily accessible in the space where the tank is located
D:have a drain cock at the lowest point in the fuel line

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出自：海船船员证

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