血中Hb含量低于多少时,即使重度缺氧,亦难发现发绀A.<50g/LB.<60g/LC.<70g/LD.<80g/LE.<90g/L

血中Hb含量低于多少时,即使重度缺氧,亦难发现发绀

A.<50g/L

B.<60g/L

C.<70g/L

D.<80g/L

E.<90g/L


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