Your vessel is equipped with totally enclosed lifeboats. Which statement is TRUE when the boat is enveloped in flames?（）.

A.The ventilators will automatically close by the action of fusible links

B.The motor takes its air supply from outside the lifeboat to prevent asphyxiation of the crew

C.A water spray system to cool the outside of the boat is operated by a high-volume manual pump

D.An air tank will provide about ten minutes of air for the survivors and the engine

蛛网膜下隙出血最可靠的诊断依据是（）

A.头痛、呕吐

B.脑膜刺激征

C.腰穿时发现血性脑脊液

D.一侧动眼神经麻痹

E.偏瘫