With economy developing at great speed, our city has ________ quite a few changes in recent years.

A．witnessed

B．accumulated

C．arisen

D．introduced

糖尿病酮症酸中毒治疗中补碱的指征是（）

A.二氧化碳结合力小于13.5mmol／L（30Vo1％）

B.血pH小于6.9

C.血酮体阳性

D.血清碳酸氢根浓度小于5mmol／L

E.低血压