血中Hb含量低于多少时,即使重度缺氧,也难以出现发绀A、 血中Hb含量低于多少时,即使重度缺氧,也难以出现发绀A、B、C、D、E、

血中Hb含量低于多少时,即使重度缺氧,也难以出现发绀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,也难以出现发绀

A、<50g/L

B、<60g/L

C、<70g/L

D、<80g/L

E、<90g/L


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