患儿,3岁半,脸色渐苍白3年,脾肋下4cm,Hb 52g/L,WBC: 7.5 X 109/L, N 0.35, L 0. 67, M 0.02, RC 0.02,MCV 65fL, MCH 24pg,MCH C 27%, HbF 42%,此患儿最可能的诊断是
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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