单项选择题
A.Coast Guard approved
B.stamped with maximum working loads
C.securely fastened
D.positioned exactly at the bow of the towed vessel
单项选择题 Fire protection regulations for towing vessels require any fuel line subject to internal head pressure from fuel in the tank to（）.
单项选择题 Fire protection regulations for towing vessels require all crew members to know how to perform each of these tasks EXCEPT（）.
单项选择题 Fire protection regulations for towing vessels allow all of these types of fuel piping，EXCEPT（）.