单项选择题

What should a driver do when ascending

A．Rise slowly.
B．Breathe faster.
C．Relax completely.
D．Breathe helium.
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单项选择题
What happens to nitrogen in body tissues if a diver ascends too quickly
A．It forms bubbles.
B．It goes directly to the brain.
C．It is reabsorbed by the lungs.
D．It has a narcotic effect.
单项选择题
It can be inferred from the passage that which of the following presents the greatest danger to diver
A．Pressurized helium.
B．Nitrogen diffusion.
C．Nitrogen bubbles.
D．An air embolism.
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