实际碳酸氢盐（AB）=标准碳酸氢盐（SB）且小于正常值，表明（）

A.代谢性酸中毒

B.呼吸性酸中毒

C.代谢性碱中毒

D.呼吸性碱中毒

E.无酸碱平衡紊乱

Regulations of Customs duties on Imports and Exports of the People' s Republic of China is one of the _______ basis of the collection of the Customs duty.

A．legal
B．financial
C．managerial
D．none of the above