单选题Fire protection regulations for towing vessels require any fuel line subject to internal head pressure from fuel in the tank to（）.Abe fitted with a positive fuel shut-off valve located at the tankBhave a shut-off valve at the top of the tankChave a gate valve easily accessible in the space where the tank is locatedDhave a drain cock at the lowest point in the fuel line
单选题
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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