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（）.
A.persons in the space wear gas masks
B.persons in the space wear damp cloths over their mouths and nostrils
C.ventilation system is secured and all persons leave the space
D.ventilation system is kept operating
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相关考题
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单项选择题
Inflatable liferafts are less maneuverable than lifeboats due to their（）.
A.shape
B.shallow draft
C.large sail area
D.All of the above -
单项选择题
In which situation could a vessel most easily capsize?（）
A.Running into head seas
B.Running in the trough
C.Running with following seas
D.Anchored with your bow into the seas -
单项选择题
In heavy seas you decide to heave to. The lifeboat should be（）.
A.brought to a position with the stern into the seas
B.allowed to take its own head
C.brought to lay in the trough
D.brought bow into the seas
