呼吸性酸中毒合并代谢性碱中毒的血气改变有()
A.pH下降
B.HCO3-减少
C.血钾降低
D.血氯降低
E.二氧化碳分压下降
参考答案:C, D
—The accident was really terrible.
—Yes, it was. The young man on the bicycle was too .
A.careless
B.careful
C.carelessly
D.carefully
设函数z=f(x,y) (xy≠0)满足