小儿骨髓外造血的器官是()
A.卵巢
B.胆囊
C.脾脏
D.淋巴管
E.盲肠
参考答案:C
It is no longer a problem _______ the poor children in this district can go to school.
A.that
B.whether
C.so
D.because
下列哪项反映消化道的出血量最敏感()
A.血红蛋白浓度
B.血细胞比容
C.血压
D.心率变化
E.尿量