單項(xiàng)選擇題

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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