单项选择题
A.fire pumps
B.fire mains
C.hydrants and hoses
D.closing appliances which are kept permanently closed at sea
单项选择题 （） is not the information necessary for the master to obtain guidance as to the stability of the ship.
单项选择题 Which document lists all the lifesaving equipment required for a vessel? （）
单项选择题 Where will you find the requirements for the signals that must be sounded by a mobile offshore drilling unit that is being towed through an area of restricted visibility? （）