The word "diffuses" in Para. 3 is closest in meaning to ______.
A. yields
B. starts
C. surfaces
D. travels
What should a driver do when ascending
A. Rise slowly.
Breathe faster.
C. Relax completely.
D. Breathe helium.
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.
男性患者，25岁，因泌尿系统感染注射链霉素后，发生链霉素过敏性休克。病人宜选用的抢救药物是
A. 去甲肾上腺素+肾上腺素
B. 间羟胺
C. 肾上腺素
D. 多巴胺
E. 肾上腺素+地塞米松
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