患儿,13个月。血常规:血红蛋白50g/L,红细胞2.5×1012/L。此患儿的贫血程度为()
A.正常血象
B.轻度贫血
C.中度贫血
D.重度贫血
E.极重度贫血
参考答案:D
Which of the following laboratory tests is considered the most reliable indicator of renal function
A. BUN.B. Urinalysis.C. Serum potassium.D. Serum creatinin
自然资源可分为 和 。