测定水中某些不稳定成分如溶解氧、游离二氧化碳时应现场取样测定。()
参考答案:对
— What does your sister do?
— ___________________.[ ]
A. My sister
B. A doctor
C. A daughter
D. Lily
重庆市副市长的职务等级名称是:
A.厅局级正职
B.厅局级副职
C.省部级副职
D.省部级正职