问题：
[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
参考答案：
A
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