The Great Wall is _____ the north of China. [ ]
A. in
B. to
C. through
D. across
D
血清酶检测对病毒性肝炎的诊断最为敏感和有意义的是()
A.AST
B.AKP
C.ALT
D.γ-谷氨酰转肽酶
E.乳酸脱氢酶
肾调节酸碱平衡的机制为
A.尿的酸化
B.产生NH3并与H+结合成NH4+排出
C.HC03-重吸收
D.Na+ -H+交换,排H+
E.尿的碱化