单项选择题
Multiple fire pumps may be used for other purposes provided that one pump is（）.
A.on line to the fire main B.kept available for use on the fire main at all times C.capable of being connected to the fire main D.rated at or above 125 psi
单项选择题 Large volumes of carbon dioxide are safe and effective for fighting fires in enclosed spaces，such as in a pumproom，provided that the（）.
单项选择题 Inflatable liferafts are less maneuverable than lifeboats due to their（）.
单项选择题 In which situation could a vessel most easily capsize?（）
