18.正常人靜脈血液氣體之含氧飽和度(saturation of oxygen)為何?
(A)25~30%
(B)40~50%
(C)60~85%
(D)90~99%
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統計: A(358), B(715), C(1478), D(485), E(0) #2180672
統計: A(358), B(715), C(1478), D(485), E(0) #2180672